On a Rubiks cube, the center tile always remains constant. I was surprised at this when I accidentally broke one apart to find a static 3d cross piece to each cube face (e.g. a non-moving tile). Everything else rotates around it

I think you thought a /s can be sometimes implied in HN comments

I came to this comment because I was also thinking that this was a bug. Interesting to know this is by design.

The center tiles on a Rubik's cube don't move, they only rotate in place.