Optical Illusion Thread: The lines you see are perfectly straight.

The worst for me are the 3d spinning dancers where you have to try reeeeeeaaaallly hard to make it spin the other way.

This one:

Spinning_Dancer.gif

I love this one. The trick to getting it to switch is to key in on the diagonally outstretched leg on one side (left or right) and dart your eyes from the leg on one side to the opposite and back, similar to trying to single out a spinning blade on a ceiling fan. After a few seconds your brain will adjust to the new rotation. Sometimes it is even automatic.
 
Don't get it, the circles stood out very clearly to me

I looked at this one for about an 30 minutes yesterday, and nothing. I was sure everyone in this thread was messing with me. And now this morning, BAM!, there they are. Goddamit.
 
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