"For our latest mission, 50 Improv Everywhere agents created an art gallery opening on the 23rd Street subway platform in Manhattan. We put up 30 placards next to objects in the space (pipes, electrical boxes, signs, advertisements), transforming them into works of art. The gallery included a bar, a coat rack, and a cellist" (more)
Improv Everywhere causes scenes of chaos and joy in public places. Created in August of 2001 by Charlie Todd, Improv Everywhere has executed over 80 missions involving thousands of undercover agents. The group is based in New York City.
The thing I like the most about this kind of performance is people face... They are like have just seen a couple of ghosts!