Pretty cool stuff it appears as i am left brained. LOL then on another test after i looked at the circles a while the other brain test scored a 6/6 meaning i had equally right and left brain qualities.

Then while looking at the spinning beauty i briefly made her stop spinning.
Now if only i could stop spinning. OH thats not me it's my brain.

Those were absolutely fascinating, thank you for posting them. I especially liked split facial images ... http://www.viewzone.com/bicam.html   Some photo editing software enables you to do mirror images, so you can play with it yourself.

More than 20 years there was a book about analyzing faces through splitting them both vertically then horizontally, analyzing each quadrant. Don't remember the name or author ... but was amazing in its approach.

Yes, it is kind of fun stuff, I also liked them.
While I could not make the lady stop all the way, I made her for quite a few seconds go half-way left to half-way right, 180 degrees spins back and forth, left to right, never not even 1 full circle, then after a few seconds of such I just let her go to her regular spins of a few spins left to a few spins right and back and forth like so.
It is the first time that I was able to do that, it is a little control over the optical illusion, it all has to do with how your eyes look at it, there is a little strain involved in controlling the illusion and or in trying to.
Good Luck!