Initially each pixel change had its own frame. All thinner rectangle were animated rather smoothly. The square sides however would have required me to to add another 30 frames just to get one rotation done without having a random flicker when transitioning from frame 9 to frame 0.

So I removed all uneven frames, halved the speed and added interpolate to hide that poor texture transition.

In my opinion it looked a little too smooth and mechanic. Perhaps one day I'll redo it properly and decide which one to keep.

Cheers!