Murata Boy rides a bicycle. Murata Girl rides a unicycle. But the Murata Cheerleaders, the latest iteration of androids from Japan’s Murata Manufacturing, are another proposition entirely, an army of small robots that balance on metal balls, dancing and flashing lights in unison. The Cheerleaders use gyroscopic sensors with inverted-pendulum control to stay upright which, Murata’s Koichi Yoshikawa assures us is a significant challenge in itself.