This interdisciplinary collection ofessays probes the impact of the market economy on art and science in the post-Berlin Wall era.

"Part One: Science for Sale," A Dollar Green Science Scene, focuses on new alliances of contemporary science and education with commercial funding, and the commodification of knowledge. Among the questions addressed here are: Does proximity to economic power eclipse freedom of knowledge? When science and education become businesses, what are the risks for a sell-out of patented knowledge, an abuse of research for business purposes or a commercialization of symbolic power?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

Part Two: Art for Sale, Buy Buy Art, elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

Part Two: Art for Sale, Buy Buy Art, elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but

For the first time in history, scholars working on language and culture from within an evolutionary epistemological framework, and thereby emphasizing complementary or deviating theories of the Modern Synthesis, were brought together. Of course there have been excellent conferences on Evolutionary Epistemology in the past, as well as numerous conferences on the topics of Language and Culture. However, until now these disciplines had not been brought together into one all-encompassing conference.

Moreover, previously there never had been such stress on alternative and complementary theories of the Modern Synthesis. Today we know that natural selection and evolution are far from synonymous and that they do not explain isomorphic phenomena in the world. 'Taking Darwin seriously' is the way to go, but today the time has come to take alternative and complementary theories that developed after the Modern Synthesis, equally seriously, and, furthermore, to examine how language and culture can merit from these diverse disciplines.

As this volume will make clear, a specific inter- and transdisciplinary approach is one of the next crucial steps that needs to be taken, if we ever want to unravel the secrets of phenomena such as language and culture.

Quantum Structures and the Nature of Reality is a collection of papers written for an interdisciplinary audience about the quantum structure research within the International Quantum Structures Association. The advent of quantum mechanics has changed our scientific worldview in a fundamental way. Many popular and semi-popular books have been published about the paradoxical aspects of quantum mechanics. Usually, however, these reflections find their origin in the standard views on quantum mechanics, most of all the wave-particle duality picture. Contrary to relativity theory, where the meaning of its revolutionary ideas was linked from the start with deep structural changes in the geometrical nature of our world, the deep structural changes about the nature of our reality that are indicated by quantum mechanics cannot be traced within the standard formulation. The study of the structure of quantum theory, its logical content, its axiomatic foundation, has been motivated primarily by the search for their structural changes. Due to the high mathematical sophistication of this quantum structure research, no books have been published which try to explain the recent results for an interdisciplinary audience. This book tries to fill this gap by collecting contributions from some of the main researchers in the field. They reveal the steps that have been taken towards a deeper structural understanding of quantum theory.

A World in Transition, Humankind and Nature is appropriately entitled after its aim for an intrinsic property of reality: change. Of major concern, in this era of transformation, is the extensive and profound interaction of humankind with nature. The global-scale social and technological project of humankind definitely involves a myriad of changes of the ecosphere. This book develops, from the call for an interdisciplinary synthesis and respect of plurality, acknowledging the evolving scientific truth, to the need for an integrated but inevitably provisional worldview. Contributors from different parts of the world focus on four modes of change: (i) Social change and the individual condition, (ii) Complex evolution and fundamental emergent transformations, (iii) Ecological transformation and responsibility inquiries, (iv) The economic-ecological and socio-technical equilibria. Primarily concerned with the deep transformations of humankind and of the relationship between humans and nature, it is addressed to a broad and thinking public that wants to be kept informed.

This book considers philosophy to be more than mere reflection. Through philosophy, humankind can give meaning to the world. In part, this book re-evaluates the philosophy of Leo Apostel, who dedicated his life to the investigation of the use of philosophy in everyday life. But it is also a presentation of international research carried out along the lines of the worldviews project. The contributions address not only professional philosophers, but also students, teachers, academics and everyone interested in the relationship between philosophy and the world.

The articles collected in this volume point out that society as a whole is changing. Social change is due not only to changes in technology and economy, but also to the changing strategies and discourses of social scientists. To what exactly will this change lead in the 21st century? What kind of society lies ahead? In this book the reader will find many arguments and hints pertaining to these questions. She/he will be confronted by a plethora of enriching conceptions of the relationships between social sciences and social changes.

How do science, producing knowledge and technology, and art, producing revelations and sensations, confront each other? We have taken up the two myths of Albert Einstein and Rene Magritte to address this question. The meeting between Einstein and Magritte is presented as an experiment, with which we hope to go beyond the many programmatical appeals, in order to cut across art and science. The experiment brings together scientists, artists and philosophers who have already - in their own distinctive ways - taken the path towards interdisciplinarity. This book presents their different attitudes, and encloses new perspectives and insights. The contributions have been written for a broad audience of scholars, students and anyone interested in the similarities between science and art.

Einstein Meets Magritte: An Interdisciplinary Reflection presents insights of the renowned key speakers of the interdisciplinary Einstein meets Magritte conference (1995, Brussels Free University). The contributions elaborate on fundamental questions of science, with regard to the contemporary world, and push beyond the borders of traditional approaches. All of the articles in this volume address this fundamental theme, but somewhere along the road the volume expanded to become much more than a mere expression of the conference's dynamics. The articles not only deal with several scientific disciplines, they also confront these fields with the full spectrum of contemporary life, and become new science. As such, this volume presents a state-of-the-art reflection of science in the world today, in all its diversity. The contributions are accessible to a large audience of scientists, students, educators, and everyone who wants to keep up with science today.

This book provides an interdisciplinary perspective on one of the most fascinating and important open questions in science: What is quantum mechanics talking about? Quantum theory is perhaps our best confirmed physical theory. However, despite its great empirical effectiveness and the subsequent technological developments that it gave rise to in the 20th century, from the interpretation of the periodic table of elements to CD players, holograms and quantum state teleportation, it stands even today without a universally accepted interpretation. The novelty of the book comes from the multiple viewpoints and subjects investigated by a group of researchers from Europe and North and South America.

Recent years have been characterized by tremendous advances in quantum information and communication, both theoretically and experimentally. In addition, mathematical methods of quantum information and quantum probability have begun spreading to other areas of research, beyond physics. One exciting new possibility involves applying these methods to information science and computer science (without direct relation to the problems of creation of quantum computers). The aim of this Special Volume is to encourage scientists, especially the new generation (master and PhD students), working in computer science and related mathematical fields to explore novel possibilities based on the mathematical formalisms of quantum information and probability. The contributing authors, who hail from various countries, combine extensive quantum methods expertise with real-world experience in application of these methods to computer science. The problems considered chiefly concern quantum information-probability based modeling in the following areas: information foraging; interactive quantum information access; deep convolutional neural networks; decision making; quantum dynamics; open quantum systems; and theory of contextual probability. The book offers young scientists (students, PhD, postdocs) an essential introduction to applying the mathematical apparatus of quantum theory to computer science, information retrieval, and information processes.

This book provides an interdisciplinary approach to one of the most fascinating and important open questions in science: What is quantum mechanics really talking about? In the last decades quantum mechanics has given rise to a new quantum technological era, a revolution taking place today especially within the field of quantum information processing; which goes from quantum teleportation and cryptography to quantum computation. Quantum theory is probably our best confirmed physical theory. However, in spite of its great empirical effectiveness it stands today still without a universally accepted physical representation that allows us to understand its relation to the world and reality.The novelty of the book comes from the multiple perspectives put forward by top researchers in quantum mechanics, from Europe as well as North and South America, discussing the meaning and structure of the theory of quanta. The book comprises in a balanced manner physical, philosophical, logical and mathematical approaches to quantum mechanics and quantum information. Going from quantum superpositions and entanglement to dynamics and the problem of identity; from quantum logic, computation and quasi-set theory to the category approach and teleportation; from realism and empiricism to operationalism and instrumentalism; the book considers from different angles some of the most intriguing questions in the field.From Buenos Aires to Brussels and Cagliari, from Florence to Florianopolis, the interaction between different groups is reflected in the many different articles. This book is interesting not only to the specialists but also to the general public attempting to get a grasp on some of the most fundamental questions of present quantum physics.

This book provides a new original perspective on one of the most fascinating and important open questions in science: What is quantum mechanics talking about? Quantum theory is perhaps our best confirmed physical theory. However, in spite of its great empirical effectiveness and the subsequent technological developments that it gave rise to in the 20th century, from the interpretation of the periodic table of elements to CD players, holograms and quantum state teleportation, it stands even today without a universally accepted interpretation. The novelty of the book comes from the multiple viewpoints and the original angles taken by a group of young researchers from Europe and South America who gathered for several years under the auspices of the Center Leo Apostel.Each member of the group presented ideas concerning the interpretation of quantum mechanics. We had discussions ranging from the philosophical underpinnings of local realism and holism, information and decision theoretic approaches to quantum theory all the way to the many worlds interpretation. Strikingly, in much the same way as different - and indeed incompatible observations are needed to fully describe the physical state of affairs in quantum mechanics - the various interpretations of the theory also seem to shed viable, but not necessarily compatible, perspectives on different aspects of the same grand framework. The discussions that followed were both technical and lively, but perhaps their most remarkable quality was the absence of rigid points of view that unfortunately seems to paralyze so much of the discussion in this area. This book is an expression which can be interesting not only to the specialists but also for the general public attempting to get a grasp on one of the still most fundamental questions of present physics.

This is a book presenting to a wide audience of readers, ranging from fans of science to professional researchers, some of the authors' recent discoveries in three distinct, but intimately related domains: probability theory (Bertrand's paradox), observation in physics (the measurement problem) and the modeling of experiments in psychology (quantum cognition). In all three of these domains of investigation, and the associated problems, the authors explain how to advantageously use the key notion of universal measurement, which constitutes the fil rouge of the whole text.

This is a book presenting to a wide audience of readers, ranging from fans of science to professional researchers, some of the authors' recent discoveries in three distinct, but intimately related domains: probability theory (Bertrand's paradox), observation in physics (the measurement problem) and the modeling of experiments in psychology (quantum cognition). In all three of these domains of investigation, and the associated problems, the authors explain how to advantageously use the key notion of universal measurement, which constitutes the fil rouge of the whole text.

The present volume is part of the 'Worldviews, Science and Us' series of proceedings. It contains selected contributions on the subject of bridging knowledge and its implications for our perspectives of the world. This volume also represents the proceedings of the interdisciplinary stream of the international workshop (Part 1) Times of Entanglement, 21-22 September 2010 at the Minsheng Art Museum in Shanghai, People's Republic of China in the context of the Shanghai World Expo 2010 and, related cutting-edge investigations in the quantum paradigm from discussion panels organized by the Leo Apostel Center for Interdisciplinary studies within the framework of the 'Research on the Construction of Integrating Worldviews' research community set up by the Flanders Fund for Scientific Research. Further information about this research community and a full list of the associated international research centers can be found at www.vub.ac.be/CLEA/res/worldviews/.

This volume is part of the "Worldviews, Science and Us" series of proceedings and contains several contributions on the subject of worlds, cultures and society. It represents the proceedings of several workshops and discussion panels organized by the Leo Apostel Center for Interdisciplinary studies within the framework of the "Research on the Construction of Integrating Worldviews" research community set up by the Flanders Fund for Scientific Research, over the period of time between 2005 to 2010. Further information about this research community and a full list of the associated international research centers can be found at http://www.vub.ac.be/CLEA/res/worldviews/

This interdisciplinary collection ofessays probes the impact of the market economy on art and science in the post-Berlin Wall era.

"Part One: Science for Sale," A Dollar Green Science Scene, focuses on new alliances of contemporary science and education with commercial funding, and the commodification of knowledge. Among the questions addressed here are: Does proximity to economic power eclipse freedom of knowledge? When science and education become businesses, what are the risks for a sell-out of patented knowledge, an abuse of research for business purposes or a commercialization of symbolic power?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

Part Two: Art for Sale, Buy Buy Art, elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

Part Two: Art for Sale, Buy Buy Art, elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but art costs money and artists cannot survive on their love for art alone. How do artists respond to the rise of economic strictures in modern culture in general and the art market in particular? When works of art become investments, can art still be critical of economic injustice? What role remains for the artist in a global, late-capitalist society?

"Part Two: Art for Sale, Buy Buy Art," elaborates on the multifaceted and ambiguous relationship between art and capital. Contemporary art claims to be autonomous, but

The articles collected in this volume point out that society as a whole is changing. Social change is due not only to changes in technology and economy, but also to the changing strategies and discourses of social scientists. To what exactly will this change lead in the 21st century? What kind of society lies ahead? In this book the reader will find many arguments and hints pertaining to these questions. She/he will be confronted by a plethora of enriching conceptions of the relationships between social sciences and social changes.

Einstein Meets Magritte: An Interdisciplinary Reflection presents insights of the renowned key speakers of the interdisciplinary Einstein meets Magritte conference (1995, Brussels Free University). The contributions elaborate on fundamental questions of science, with regard to the contemporary world, and push beyond the borders of traditional approaches. All of the articles in this volume address this fundamental theme, but somewhere along the road the volume expanded to become much more than a mere expression of the conference's dynamics. The articles not only deal with several scientific disciplines, they also confront these fields with the full spectrum of contemporary life, and become new science. As such, this volume presents a state-of-the-art reflection of science in the world today, in all its diversity. The contributions are accessible to a large audience of scientists, students, educators, and everyone who wants to keep up with science today.

A World in Transition, Humankind and Nature is appropriately entitled after its aim for an intrinsic property of reality: change. Of major concern, in this era of transformation, is the extensive and profound interaction of humankind with nature. The global-scale social and technological project of humankind definitely involves a myriad of changes of the ecosphere. This book develops, from the call for an interdisciplinary synthesis and respect of plurality, acknowledging the evolving scientific truth, to the need for an integrated but inevitably provisional worldview. Contributors from different parts of the world focus on four modes of change: (i) Social change and the individual condition, (ii) Complex evolution and fundamental emergent transformations, (iii) Ecological transformation and responsibility inquiries, (iv) The economic-ecological and socio-technical equilibria. Primarily concerned with the deep transformations of humankind and of the relationship between humans and nature, it is addressed to a broad and thinking public that wants to be kept informed.

This book considers philosophy to be more than mere reflection. Through philosophy, humankind can give meaning to the world. In part, this book re-evaluates the philosophy of Leo Apostel, who dedicated his life to the investigation of the use of philosophy in everyday life. But it is also a presentation of international research carried out along the lines of the worldviews project. The contributions address not only professional philosophers, but also students, teachers, academics and everyone interested in the relationship between philosophy and the world.

How do science, producing knowledge and technology, and art, producing revelations and sensations, confront each other? We have taken up the two myths of Albert Einstein and Rene Magritte to address this question. The meeting between Einstein and Magritte is presented as an experiment, with which we hope to go beyond the many programmatical appeals, in order to cut across art and science. The experiment brings together scientists, artists and philosophers who have already - in their own distinctive ways - taken the path towards interdisciplinarity. This book presents their different attitudes, and encloses new perspectives and insights. The contributions have been written for a broad audience of scholars, students and anyone interested in the similarities between science and art.

For the first time in history, scholars working on language and culture from within an evolutionary epistemological framework, and thereby emphasizing complementary or deviating theories of the Modern Synthesis, were brought together. Of course there have been excellent conferences on Evolutionary Epistemology in the past, as well as numerous conferences on the topics of Language and Culture. However, until now these disciplines had not been brought together into one all-encompassing conference.

Moreover, previously there never had been such stress on alternative and complementary theories of the Modern Synthesis. Today we know that natural selection and evolution are far from synonymous and that they do not explain isomorphic phenomena in the world. 'Taking Darwin seriously' is the way to go, but today the time has come to take alternative and complementary theories that developed after the Modern Synthesis, equally seriously, and, furthermore, to examine how language and culture can merit from these diverse disciplines.

As this volume will make clear, a specific inter- and transdisciplinary approach is one of the next crucial steps that needs to be taken, if we ever want to unravel the secrets of phenomena such as language and culture.

Globalization brings people and cultures together, producing, in addition to deep and rich encounters, exclusion, racism, xenophobia and asymmetries. The present book takes these issues implicitly as its starting point by thoroughly reflecting on them from a perspective of worldviews, as one of many approaches.

More specifically, it focuses on people s implicit and explicit interpretations and assumptions of the world, of themselves and of others. Often deeply rooted and hard to change, they have an important function, for without them we would continually need to question what we do and what we think. In their absolutist form, these assumptions may become a barrier for open-mindedness, and hence for deep intercultural understanding and exchange. We need to find a balance between both stances.

Intercultural philosophy tries to fulfil this role, on the one hand by comparing different cultures on a deep philosophical level, and as a way to better understand each other s core assumptions, and on the other hand by arguing for an intercultural philosophy grounded in specific cases. The contributions of this book conceive of "another possible world" which does not condemn cultural and religious diversity as a detonator for "Clashes of Civilizations," but rather welcomes it as a source of inspiration for all and of respect for the "different.""

Quantum Structures and the Nature of Reality is a collection of papers written for an interdisciplinary audience about the quantum structure research within the International Quantum Structures Association. The advent of quantum mechanics has changed our scientific worldview in a fundamental way. Many popular and semi-popular books have been published about the paradoxical aspects of quantum mechanics. Usually, however, these reflections find their origin in the standard views on quantum mechanics, most of all the wave-particle duality picture. Contrary to relativity theory, where the meaning of its revolutionary ideas was linked from the start with deep structural changes in the geometrical nature of our world, the deep structural changes about the nature of our reality that are indicated by quantum mechanics cannot be traced within the standard formulation. The study of the structure of quantum theory, its logical content, its axiomatic foundation, has been motivated primarily by the search for their structural changes. Due to the high mathematical sophistication of this quantum structure research, no books have been published which try to explain the recent results for an interdisciplinary audience. This book tries to fill this gap by collecting contributions from some of the main researchers in the field. They reveal the steps that have been taken towards a deeper structural understanding of quantum theory.