Optical Illusions

Is this possible?



Are the purple lines straight or bent?


Do you see gray areas between the squares?
Where did they come from?


You should see a man's face and also a word...
Hint: Try tilting your head to the right, and the word begins with letter L.

Are the wheels rotating or not?
This is not an animated picture; your eyes are making the wheels rotate.
To test this, stare at one spot for about ten seconds, and all wheels will stop rotating.
Or look at the black center of each wheel, and it will stop moving.
Move your eyes to the next black center, and the previous wheel will move.


Is the book pointing at you?  Or away from you?

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