Here's my entry for the contest.  This is a modern 
interpretation of Escher's DoublePlanetoid.  

It contains 38,446 polys and 14.4 MB of image maps. 
It took 18 minutes to render on a dual Pentium Pro 200 
with 128MB RAM.  The illusion of enmeshed structures 
between the earth and city pyramids was created by using 
carefully placed cylinders and oblong spheres as boolean 
subtraction tools at points where the two objects 
intersected.  The boolean surfaces were given a dark 
surface color to add a greater sense of depth.  

Peter Stallo is a 26 year old graduate student in nursing 
at the University of Southern Mississippi in Meridian. 
He is a Microsoft Certified Professional, Visual Basic 
programmer, and is working on his MCSE. His company, 
Nursing Dynamics, Inc. provides educational multimedia 
software for nursing schools across the country.