The essays in this volume, first presented at an international conference held at the University of Urbino, Italy, in 2011, explore the different senses of realism, arguing both for and against its distinctive theses and considering these senses from a historical point of view. The first sense is the metaphysical thesis that whatever exists does so, and has the properties it has, independently of whether it is the object of a person's thought or perception. The second sense of realism is epistemological, wherein realism claims that, in some cases, it is possible to know the world as it exists in and of itself. A third sense, which has become known as ontological realism, states that universals exist as well as individuals. The essays collected here make new contributions to these fundamental philosophical issues, which have largely defined western analytic philosophy, from Plato and Aristotle to the present day.

This volume is about ontological categories. The categories of an ontology are designed to classify all existents. They are crucial and characterize an ontology.

The two eminent metaphysicians Armstrong and Grossmann exchanged letters for ten years in which they discussed crucial points of their respective ontologies. They have a common basis. Both do metaphysics proper and not linguistic philosophy. Both advocate universals and acknowledge the key position of the category of states of affairs. However, they differ on the simplicity of universals and the nature of states of affairs. There is also a fundamental methodological disagreement between them. Armstrong accepts only the evidence of natural science and has a materialist view on mind while Grossmann is a dualist and grants also the same evidential status to the phenomenological data of perception and introspection. The letters are grouped into three phases. The first is the issue of universals, the second the ontological analysis of laws of nature and the third the ontology of numbers. The book contains also longer comments and reviews, partly not published until now.

Reinhardt Grossmann is one of the most sophisticated, knowledgeable and original contemporary metaphysicians. Although he was a student of Bergmann, he influenced the development of Bergmann's metaphysics considerably. No philosopher other than Grossmann defends perception to that degree against the persistent skeptical arguments. He characterizes his epistemological positions as radical empiricism and radical realism. By realism Grossmann mainly means the view that the material things we perceive exist. It is thus also an ontological position and closely related to his empiricism. Grossmann's empiricism is radical insofar as he claims that entities of all categories are perceptible, even numbers and universals. Grossmann's universal realism advocates a theory of abstract categories against the current naturalism. He distinguishes between the world and the physical universe. The latter is the domain of science; the former is the subject of ontology.

The metaphysics of ordinary objects is an increasingly vibrant field of study for philosophers. This volume gathers insights from a number of leading authors, who together tackle the central issues in contemporary debates about the subject. Their essays engage with topics including composition, persistence, perception, categories, images, artifacts, truthmakers, metaontology, and the relationship between the manifest and scientific images. Exploring the nature of everyday things, the contributors situate their arguments and the latest research against the background of the field's development. Moreover, many essays propose new ideas and approaches, looking ahead to the future of the metaphysical study of ordinary objects. Featuring numerous clearly explained examples and with thoughtful links drawn to other, related disciplines such as pragmatism, this wide-ranging volume fills a major gap in the literature and will be important for scholars working in metaphysics.