It seems to be a square like many others, but they press the switch something MAGIC occurs

The imaginative operators of the Improv Everywhere group decided to put their skills in creating spectacular situations for the holiday season. In this small square in New York they installed 50,000 lights, scattered on the facilities of the park and even on people, who agreed to take part in this show-performance. When curious passers-by approach the switch and turn it on, something magical happens.