What you are about to see is pretty cool.

An optical illusion posted online asks readers to stare at the white dot at the center of a negative of the woman's face.  Give it about 15 seconds, then look at the white space to the right of the negative image.

Some people see a full-color face of a young brunette woman. WOW!

What's going on here is known as a 'negative afterimage' and is caused by cells located in the eyes, called ganglion cells, which send messages to the brain by coding - or identifying - colors in pairs of primary colors. When the cells identifying one color become fatigued - the opposite hue becomes stronger....blah, blah, blah...it's pretty cool.

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