This optical illusion tricks you into seeing different colors. How does it work? – Livescience.com

These levitating spheres may appear red, purple or green at first glance, but in actuality, all 12 orbs are the same bland shade of beige.  
Shrinking the image exaggerates this illusion, while zooming in minimizes the effect, according to David Novick, the creator of the image and a professor of engineering education and leadership at the University of Texas at El Paso. But why do we perceive the spheres as anything but their true color
, beige? 
This skewed perception stems from a phenomenon known…

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