I’m sure this must’ve been asked before, but I couldn’t find it in a search.
Anyway there’s a gif of a dancer spinning. I can only see her spinning clockwise. Supposedly some will see her spinning counterclockwise (or anticlockwise if you prefer). Some can see either way
Can anyone see her spin either way?
If I time blinking just right, I can make her reverse direction at will.
That is, when I’m not distracted by what appears to be an erect nipple.
You’re right, this has been posted before but I can’t find it either.
I wouldn’t say that I can make her change direction at will, but I have seen both ways. Maybe try covering all but her foot until you can see that part spinning anti-clockwise, and then slowly uncover the rest of her.
There have been at least three threads:
I can see it both ways, no problem. I can switch it when her leg passes the other one.
I can do it, but it is more at random.
It didn’t take me long to be able to mentally switch at will.
I am sure this is obvious, but for me the trick is, when you perceive the leg to be nearer to you, try to think of the leg as further away from you, then she starts spinning the other way.
This page has a tool to help you see her spinning either way by adding temporary “eyes”:
http://www.michaelbach.de/ot/sze_silhouette/index.html
Also lots of good information/explanation about the illusion there.
For me, I find really squinting (eyes just barely open) helps me to see her change direction, but YMMV.
I go with the blinking to make her change directions.
Able to see her go both ways (heh heh heh) without covering any of the GIF or blinking. Almost suspected for a moment that the GIF reversed animation at random times, but further experimentation ruled that out.