This just drew audible gasps from Nacks age 4 to 40.

“Kinetic Rain” is composed of two parts, each consisting of 608 rain droplets made of lightweight aluminum covered with copper. Suspended from thin steel ropes above the two opposing escalators, each droplet is moved precisely and seemingly floating by a computer-controlled motor hidden in the halls ceiling. The drops follow a 15-minute, computationally designed choreography where the two parts move together in unison, sometimes mirroring, sometimes complementing, and sometimes responding to each other.

[Via]