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1 Introduction Imagine a virtual world with digital creatures that
looks like real life, sounds like real life, and even feels like
real life. Imagine a virtual world not only with nice three
dimensional graphics and animations, but also with realistic
physical laws and forces. This virtual world could be familiar,
reproducing some parts of our reality, or unfa miliar, with strange
"physical" laws and artificial life forms. As a researcher
interested in the sciences of complexity, the idea of a conference
about virtual worlds emerged from frustration. In the last few
years, there has been an increasing interest in the design of
artificial environments using image synthesis and virtual reality.
The emergence of industry standards such as VRML [1] is an illustra
tion of this growing interest. At the same time, the field of
Artificial Life has ad dressed and modeled complex phenomena such
as self organization, reproduction, development, and evolution of
artificial life like systems [2]. One of the most popular works in
this field has been Tierra designed by Tom Ray: an environment
producing synthetic organisms based on a computer metaphor of
organic life in which CPU time is the "energy" resource and memory
is the "material" resource [3]. Memory is or ganized into
informational patterns that exploit CPU time for self replication.
Muta tion generates new forms, and evolution proceeds by natural
selection as different creatures compete for CPU time and memory
space.
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