If you consider silhouettes to be NSFW, then NSFW.

I don't really believe that this is to do with left or right side brain activity, it seems to depend more on when you start looking at the animation. Interesting nonetheless. After a few minutes I could get it to reliably change direction at will.

Also good to see Bambi posting again. I was starting to worry that I'd had a schizophrenic episode, registered lots of imaginary Blogger accounts and forgotten about it.