Left brain vs right brain

Do you see the dancer turning clockwise or anti-clockwise?

Clockwise = right side of the brain. Ant-clockwise = left side.

For me it started with a clear clock-wise rotation, but after looking at the shadows it suddenly shifted. And then shifted back again. Scary.

Look at the animation frame by frame again. It DOES NOT reverse midway. We had 4 different people look at it at the same time and we were split in how we saw it. Some of us see it both ways as well, and some could only see it one way or the other no matter how hard they tried. It’s just one of those weird brain things.