"I'm not sure yet. It looks like a puzzle." She fiddles with it. It turns out to be possible to turn the various sections relative to one another, like a Rubik's Cube, although doing so quickly causes the tetrahedron to lose its original shape.

"Okay, that's cool," says James. "And I'd say it was way too simple, but there are more colours than sides, so I'm not even sure what would count as a solution. I'll play with it, I guess."