"...you could use the whole floor as your canvas..."

There are rigs like that demostrated at Siggraph. They are not for Photoshop painting, but so far they are more for entertainment. The really big ones make "paint splashes" based upon your body movement. I've seen smaller ones that react to hand gestures, or movements of a stylus.

Sig 2005 - E-Tech Room

http://backroom.renderosity.com/~bryce/sig2005/07_etech/ecce02_jpg.html

http://backroom.renderosity.com/~bryce/sig2005/07_etech/hap03_jpg.html

http://backroom.renderosity.com/~bryce/sig2005/07_etech/ifog05_jpg.html

http://backroom.renderosity.com/~bryce/sig2005/07_etech/khro01_jpg.html

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