In this optical illusion, (inspired from the paper: Surface color from boundaries: a new 'watercolor' illusion, by Pinna B, Brelstaff G, Spillmann L./Vision Res. 2001 Sep;41(20):2669-76.) the wavy lines appear to have shades of yellow blue dividing them, when in fact, the areas are actually the same color. Your brain has reinterpreted the image to generate a perception of a difference where none exists. This ability to "trick" the brain is the basis for the work of Anna Roe, Ph.D., a senior scientist at the Oregon National Primate Research Center Senior Scientist. (OHSU)
