That is a puzzle thing. The word cube is used very loosely. Douglas Hofstadter wrote about it back when Rubiks Cube was still new. In this case it is a stretch

That is a puzzle thing. The word cube is used very loosely. Douglas Hofstadter wrote about it back when Rubiks Cube was still new. In this case it is a stretch, but the Rubiks Cube inspiration is so clear, that I think it sort of makes sense.