urbanscreen is doing interesting work with large 3-D projections onto buildings. The most visually remarkable example is “How it woulld be if a house was dreaming,” — http://tr.im/upDT — but I think that the “Pinwall” video (5th in the list on the company’s page — http://tr.im/upzX — is interesting because of it enables the audience to use physical controls to play the game.