Complementary color illusion

Instructions

Stare at the black cross in the middle of the colored circles without moving your head for a few seconds. You should see a new circle of different color rotating around the center.

Explanation

When color receptors (cones) on some area of your eye's retina are exposed to one saturated color for an extended period, they adapt to the imbalance. As the color disappears and is replaced by a neutral color (such as gray), since its signal

has weakened, you will instead perceive its complement color.

What colors do you see? Leave your complements in the comments.

Caution: looking at the animation for too long may cause eye fatigue.