Kinetic Rain is found in the Changi Airport Singapore.  Consisting of 608 rain droplets made of lightweight aluminum covered with copper. 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 hungeree