This is an unbelievable illusion projected onto the side of the building. Watch the whole video, it’s better than this picture. Who wouldn’t freak out if they randomly walked by and saw this happening.
This would be great on the interior of a room as well. I just bought a new apartment, how cool would it be if I could shop for furniture online and I could see what they’d look like in my living room if I had a projector setup.