In which direction is she rotating?

[Local Trouble]

[SiL]

Always see her going clockwise.

[Corporal Hicks]

Anti-clockwise for me.

Odd. She started going clockwise and then quickly back to anti. What wizardry is this?!

[Russ840]

It's both. Depends on your point of reference for the start of the turn. Feet or head.

[SiL]

Tried separating both, still clockwise.

[Local Trouble]

Always see her going clockwise.

Me too, although I used to be able to change directions at will. 

Anti-clockwise for me.

Odd. She started going clockwise and then quickly back to anti. What wizardry is this?!

Would you be surprised to discover that you're slowly going mad?

[Corporal Hicks]

Would you be surprised to discover that you're slowly going mad?

Not in the slightest. 

So what's the deal then? Is there any text to go with the "experiment"?

[Local Trouble]

https://en.wikipedia.org/wiki/Spinning_Dancer

[whiterabbit]

Sorry guys, but I was staring at her boobs the entire time. Apparently the illusion fails when you do this.

[Corporal Hicks]

https://well.blogs.nytimes.com/2008/04/28/the-truth-about-the-spinning-dancer/?_r=0

I'm apparently a left brain fella and SiL is right brained.

[Local Trouble]

Have you tried seeing her rotate the other way?

[Corporal Hicks]

I thought about it and it happened.  I love these kind of illusions. They're so freaky.

[Samhain13]

I remember seeing this before. Its still the same.

Always anti-clockwise.

[SiL]

I can make her go anti-clockwise, but the second I think about it she goes back to clockwise.

[Local Trouble]

I just can't do it any more...