Popescu Filip
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Stare at the center of the colored version, then wait for it to change to black and white.

10 Optical Illusions That Will Blow Your Mind (PHOTOS)- this one (black and white) is the best! hmmm looks to me like we dont need to see in color as long as we have black dots

"Rubin Vase. This is one of the most famous optical illusions that exists. There are two things that you can see in this image ... In black you can see two faces looking directly at one another. In white, you can see an interesting curved vase."

One of my favorite things that was shown to me during my elementary age years was an optical illusion. It was the very famous Rubin Vase (pictured below) which you can see in either two ways - as a vase or as two faces that are facing each other.