If you have kids or have had kids, you’re certainly familiar with the mobile hanging on a crib. This popular innovations were patterned from the brainchild of American sculptor Alexander Calder. Mobiles are “a type of kinetic sculpture constructed to take advantage of the principle of equilibrium. It consists of a number of rods, from which weighted objects or further rods hang.”

Imagine those crib mobiles as colorful sheet metals hanging on rods on your ceiling…the shadows they create as they move would certainly be interesting too.

Today, Google Doodlers honor Calder and featured an interactive tribute where you get to play with a mobile by clicking and dragging.

Image from http://www.curbly.com/modhomeecteacher/posts/6143-how-to-make-your-own-calder-mobile