Kilobots follow simple rules to take the form of a wrench and more
M. Rubenstein et al/science 2014
One Kilobot is not very smart. Each quarter-sized bot scuffles along on three rigid legs and can communicate only with its neighbors. Yet by instructing more than 1,000 Kilobots to follow a few simple rules, computer scientist Radhika Nagpal and her team at Harvard can get the crude bots to assemble into multiple shapes — including a wrench (left), a star and the letter K — without human intervention.