Alexander Calder's 113th birthday

Alexander Calder's 113th birthday

A piece of kinetic art took the place of the usual Google logo to celebrate the 113th birthday of American artist and sculptor Alexander Calder.

Friday's Google doodle shows a mobile, a type of kinetic sculpture that was invented by Alexander Calder. Mobiles take advantage of the principle of equilibrium and have objects hanging from rods. Kinetic art uses motion for an artistic effect.