Colors that change, vanish or appear out of nowhere. Look at each illusion, say what you see, then discover the truth.
Your brain doesn't measure color like a camera: it compares it with what's around it, corrects for light and shadow, and fills in what's missing. Most of the time that helps you see the world well, but these images expose it.
Yes. The same color can look lighter, darker or a different hue depending on the background. That's why you should test a palette together rather than each color on its own.
On almost everyone, because they depend on how the eye and brain work. How strong they feel varies a little with the screen, the room lighting and the person.
Because while you stare at the pink dots, the retina cells that pick up that color get tired. Where a dot is missing you see its opposite color, green, as an afterimage.
No. They are ordinary images that just show how your brain reads color. If one makes you dizzy, look away and rest your eyes.
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