About this 3D model

This is an extrapolation of the now infamous Penrose Triangle illusion 3D model (http://www.thingiverse.com/thing:6513). If you had trouble getting your head around that one, you're not going to find this one any easier! :) Where the triangle used 9 cubes, this arrangement uses 31 cubes to make a larger sorta-notreally-cube. All versions are parallax-corrected for a viewing distance of 40cm. (the larger ones are not simply scaled up versions of the smaller ones)