This is a really impressive and interesting one. You have to concentrate quite hard to get her to change direction, but it's awesome when she does.

This one really blew me away! It took about three minutes for the effect to kick in, but it's truly amazing how this happens. Focusing on the ankles helps, especially when you scroll down so only the ankles are seen. Then it "switched around", and it seems to continue in that direction even after scrolling back up.

Look a little longer, and you might be able to "switch" it back again.