How to draw illusions?

How to draw 3d pictures like this (pics included)?

• ok basically i love these pictures and i want to know how to draw them here are some pictures: http://www.moillusions.com/wp-content/uploads/img387.imageshack.us/img387/4612/bog25wf.jpg http://www.moillusions.com/wp-content/uploads/i207.photobucket.com/albums/bb234/vurdlak8/illusions/pedestrianfire.jpg

• Answer:

  images are 3d sidewalk drawings, Julian Beever is well known for this type of artwork, http://users.skynet.be/J.Beever/pave.htm you have to use your image or drawing or photo, then map out grid with perspective angle, so when viewing artwork, it appears proportionally correct from that point of view, all other views are distorted, http://othersiderainbow.blogspot.com/2008/06/sidewalk-chalk-drawings-from-julian.html http://sosackuv.blog.cz/0701/julian-beever-malby-na-chodniku anamorphic drawing http://www.princetonol.com/groups/iad/lessons/middle/grid-drawings.htm the reference site has more info about illusion http://www.moillusions.com/2009/05/how-to-do-3d-anamorphic-artwork.html ..