A team of engineers at MIT wanted to figure out the simplest 3-D structure that can do this, and they thought of the Hoberman Twist-O, a pretty fun little toy. It's made of a network of struts connected by rotatable hinges and it can collapse in on itself. The MIT team wanted to make a shell that could do this. The resulting buckliball is made of soft rubber and has no moving parts, just 24 special dimples arranged in a specific pattern to induce optimal buckling. The dimple design inspired the new term "buckligami," for the folding patterns required to make it buckle just so.