Is this optical illusion a set-up or not?

[Jessweeee♪]

I can always make her change directions right away, but then I have trouble turning her back xD

[Værn]

I just look away from it for a second. When I focus on something else and only see it with my peripheral vision, it looks more like back-and-forth movement than a spinning motion. It looks kind of like she's skating rather than dancing. If I look back as the foot sweeps to the right, she spins clockwise; if I look as it sweeps to the left, she spins counterclockwise. Meow~