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A theory of substantial forms asserts that forms organize matter and make it intelligible. Substantial forms are the source of properties, order, unity, identity, and information about objects.
The concept of substantial forms dominates ancient Greek philosophy and medieval philosophy, but has fallen out of favour in modern philosophy. The idea of substantial forms has been abandoned for a mechanical, or "bottom-up" theory of organization. However, such mechanistic treatments have been criticized for the same reasons atomism has received criticism, viz., for merely denying the existence of certain kinds of substantial forms in favor of others and not denying substantial forms as such, an impossible move.