Stumbled across this French company, ‘Easyweb‘ the other day. They do large scale, 3D projections onto buildings. However, what makes this different to your average large projector, is that they must somehow model the building itself, so you get effects like columns that light up, panels in the building that open, water bouncing off ledges in the building, and so on.
It is just quite spectacular to watch, even on video. In real-life, it must be breathtaking!
Its not yet the sort of augemented reality you see in Minority Report, but when you see what effects are possible with todays technology, it does leave you speculating about tomorrow.