Been done and a long time ago: see Boxer: http://www.mathedpage.org/t-and-m/turtle-and-mouse.html http://www.mathedpage.org/t-and-m/turtle-and-mouse.html Not t

Been done and a long time ago: see Boxer: http://www.mathedpage.org/t-and-m/turtle-and-mouse.html http://www.mathedpage.org/t-and-m/turtle-and-mouse.html Not to mention the BioBike VPL: http://nar.oxfordjournals.org/content/37/suppl_2/W28 http://nar.oxfordjournals.org/content/37/suppl_2/W28 Not that there's anything wrong with reinventing the recursively nested rectangular wheel.