http://www.switched.com/2007/10/15/the-trippiest-optical-illusions-on-the-net/
I got to the point where i can see it both ways, and i can switch it. Really trippy though.
I got to the point where i can see it both ways, and i can switch it. Really trippy though.

i watched it a few times, and i can see it change directions right in the middle. i get a small flicker, then it changes.