Look at the spinning girl. Which way is she spinning? Clockwise or counter-clockwise? If you look away for a moment she may spin in the opposite direction! It's possible to see BOTH directions. Just give it a try. With a little practice you can make her switch at any time.
Thx everybody!
This is actually one of my old flips from Hatena times. I imported it frame by frame so it would not be a spinoff xD
If you have trouble seeing the other direction it helps to look at her feet!
I paused it and now I can see it the other way. Mind blown.
Aaa! I can only see it one way!