There is a very cool art exhibit in Madison Square Park, Pulse Park by Rafael Lozano-Hemmer. Since I won’t be able to explain it any better, here is what the Madison Square Park Conservancy had to say about it:
Visitors’ heart rates will be monitored by two heart rate sensor sculptures, and will activate two hundred theatrical spotlights, creating a pulsating matrix of light across the central Oval Lawn of the historic park.