It’s mesmerizing to watch Pe Lang‘s mechanical artwork in motion, especially this machine that arranges droplets of water on an omniphobic surface. From Triangulation:

Falling objects – positioning systems from 2009-2011 is a custom made machine that adds drops of water onto a special textured surface. Each drop forms into an almost perfect sphere through the surface tension of the water and the omniphobic material. The electronically controlled pipette wanders through a square grid of 21 x 21 drops to form a micro-matrix and returns to the beginning. After approximately 300 minutes, and when the water drops have evaporated, the same process starts again.

Sound objects make the walls and floors vibrate