There’s a lot to like about the Moss design, such as the single connection for transferring data and power between blocks. But maybe the most potentially revolutionary element is the toys’ use of rare-earth magnets—positioned, for the most part, at the corners of cubes. Along with providing a tool-free method of attaching robots to one another, these neodymium magnetic balls can serve as joints, allowing pieces to hinge or swing freely. This is a minor stroke of genius, in part because it can lead to versatile structures, but also because robots are sadly fragile and almost suicidal things, prone to breaking their own components against their environments, or against themselves. If a Moss bot slams a complex, multi-hinged appendage against a chair leg, the limb might snap off. But reattaching it should be as simple as popping the magnet(s) back into position. And that’s one of the key advantages of the modular bot concept—it can fail or fall apart in degrees, without bricking the entire assembled bot. That quality feeds into the other unique benefit of this class of robots, which is the ability to reassign them, adding new mobility modes to handle new terrain (treads for urban streets, legs for the forest, etc.) as well as new shapes and sizes to tackle different roles.