3-D Sidewalk Art

I think these are absolutely amazing and figured some of you would like to see them.

http://cdn.holytaco.com/www/sites/default/files/images/2009/12/tumblr_kt1y0tBgUH1qzzwmio1_400.jpg
http://cdn.holytaco.com/www/sites/default/files/images/2009/12/6a00e54ef84add883401127982fe2f28a4-800wi.jpg
http://cdn.holytaco.com/www/sites/default/files/images/2009/12/brother-and-sister.jpg
http://cdn.holytaco.com/www/sites/default/files/images/2009/12/edgar-mueller-1.jpg
http://cdn.holytaco.com/www/sites/default/files/images/2009/12/edgar-mueller-2.jpg
http://cdn.holytaco.com/www/sites/default/files/images/2009/12/SharkAttackbyEdgarMueller.jpg

how many dimensions?

Photochop?

I’ve seen some of these before that looked really good, but these look a little too good. Maybe just HDR’s of actual work?