No, you're not tired and no, you don't need to change your glasses -you're just about to experience some fun optical illusions that have nothing to do with fooling your eyes and everything to do with fooling your brain!
You see, our brains don't want to have to process ALL the visual stimuli we see all the time, so they use shortcuts to make snap decisions about colors, shapes andother visual cues we see during our day. While this is very handy, it also leaves room to easily 'trick' the brain into seeing things that are just not there!
Stare at the black cross, and slowly the blank spaces will become green.
When you focus your eyes above this line, the black and white dots will look likethey are rotating clockwise.
Keep your eyes on the green dot and the yellow ones will soon disappear.
Keep your eyes on the black dot and the grey strip will turn blue. 
The famous Penrose triangle is an impossible figure. Don't look too long, it may drive you insane. 
Not making it any clearer... 
Is this a painting of cats or of birds?
Which way is this train going?
These blue lines look like they're moving in pairs.
Where does the extra square in this triangle go?
Look at this black dot and see the outlines filled in with color. 
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Posted by: Raman K <kraman_4@yahoo.com>
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