Step 8Groove the faces
iImage Information

To create the illusion that the cube can spin conventionally (i.e. on three axes, not just one), I faked it using a router with a V-shaped bit to cut grooves in all the exposed faces. Use a guide - because it's hard to clamp on to a face, I just tacked the guide in place temporarily using the brad nailer the correct distance from the desired groove. I ripped a piece of wood exactly the right width so I could rout both sides using the same guide (with my router, it needed to be 56 mm). The groove doesn't look exactly like the horizontal gaps, of course, but the visual illusion holds at least at first glance.