These 'strawberries' look Red, right? (Tap image to toggle)
Color Constancy
The objects in this image appear to be red. But are there any red pixels on your screen? Tap the image to find out.
Discounting the Illuminant
💡 Retinex Theory▼
Your brain knows that light changes throughout the day (yellow sunlight, blue shade). To keep the world consistent, it attempts to "subtract" the color of the light source to determine the true color of objects.
In this illusion, the overall cyan tint forces your brain to overcompensate. It assumes the greyish pixels must be reflecting red light to appear that way under cyan illumination.