This photo is showing a moment of the Mp3 Experiment Ten at South Street Seaport in New York City. Participants carry out in sync for 45 minutes ridiculous coordinated instructions delivered to their headphones. Here thousands of people went to Pier17 when the narrator through their mobile asked the participants to through up in the air a red shirt. Mp3 is a collective prank that causes scenes of chaos and joy in public places. It was the first time for me and I did not know what to expect.