Google's homepage doodles have evolved from mere images to interactive games, toys and gadgets that take advantage of the latest in browser technology, and today's is no different. Marking the 113th birthday of artist Alexander Calder, best known for his carefully balanced "objects" mobiles, the doodle uses complex physics simulations to react to being moved around with your mouse or, if you're viewing it on a device with accelerometers, your physical movement.
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