How to draw a square circle: it's easy!
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Aaron Slomanhttp://www.cs.bham.ac.uk/~axs/
School of Computer Science
University of Birmingham
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Ludwig Wittgenstein, Tractatus 3.0321:
"Though a state of affairs that would contravene the laws
of physics can be represented by us spatially, one that
would contravene the laws of geometry cannot."
A counter-example
More examples of seeing possibilities and impossibilities:
http://www.cs.bham.ac.uk/research/projects/cogaff/misc/impossible.html
This is part of the Turing-inspired Meta-Morphogenesis project:
http://www.cs.bham.ac.uk/research/projects/cogaff/misc/meta-morphogenesis.html