I found this animated loop interesting because it contains all things that I enjoy: cats, hamburgers, and computers. Also, the animation is visually intriguing with lots of moving parts and bright colors.
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I like that although the movement of the slices of the cube seems disordered and random, it goes back to the ordered gradient it was at the beginning of the loop. Going from disordered back to ordered is almost unnatural feeling and makes for great visual interest.
I think that this animated loop is successful because it has extremely smooth transitions. The ball moving from track to track flows well, and it is very satisfying to watch the tracks perfectly line up to catch the ball.