Here's a tip: cover one half of the image with your hand, including all of her body, so you just see the leg come around. Now uncover the image. Now do the sam

Here's a tip: cover one half of the image with your hand, including all of her body, so you just see the leg come around. Now uncover the image. Now do the same thing with the other half (or two-thirds, whatever). If you do this a few times, you'll likely be able to see it go both ways. Not at will, but you can get into a mode where you are seeing her rocking back and forth rather than constantly spinning the same direction. The key is that your brain makes a snap decision about which side of her hip the leg is on, and then it's motion processing mechanism stitches all future images to match that initial impression. You can teach yourself to make her switch back and forth by refocusing on her hips. It worked for me anyway.