Echochrome would be M.C.Escher on massive amounts of, well, you make it up. A sketchy-looking applet for the PSP and PS3 that makes use of perspective, as simple as that. It also appears to be one of hell of a geeky math sandbox which can probably get you laid with a plastic ruler or the complete surface of the freemason logo (not women, no). It’s also very eminently realized in Jun Fujiki‘s OLE Coordinate System. (I also want you to look at this very carefully. People are just like spiders. Without being able to climb up walls and being patient, of course.)