Modular Robotics
Modular Robotics makes robot construction kits.
Cubelets are magnetic blocks that can be snapped together to make an endless variety of robots with no programming and no wires. You can build robots that drive around on a tabletop, respond to light, sound, and temperature, and have surprisingly lifelike behavior. But instead of programming that behaviour, you snap the cubelets together and watch the behaviour emerge like with a flock of birds or a swarm of bees.