Color-adapting category is one of the rare sections on this site that almost exclusively contains true optical illusions. The effect we showcase most often, usually makes two parts of a picture seem as if they were of a different color, even though they’re actually identical. This can often be proved by removing the contextual background, isolating only the two parts on a colorless surface. Representative example for this type of illusions would be original Checkers Illusion. But what would happen if we could produce completely opposite effect? Check out the animated .gif file below. While the two hearts are surrounded by appropriate contextually relevant colors, they seem as if they are of the same color. The moment animation changes and background colors disappear -illusion stops and we can see the truth that was there the whole time. Would be interesting to hear why you think this effect occurs? What could be causing it?!