Here are people playing the camera-based game Recurse at a New York University gaming exhibition last night.
The game is simple. Stand in front of a camera, see a projection of yourself on a TV, use your body to agitate blotches of green and avoid agitating blotches of red. See it played here from a video that appears on designer Matt Parker's official Recurse website:
Collage: Recurse Flickr photostream