Asahi illusion
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The Asahi illusion (Japanese: asahi = morning sun) is an optical illusion that tricks the viewer into thinking a colour is much brighter than it truly is. It is based on a flower-like figure with petals arranged in a circle, which are very dark on the outside and become increasingly lighter in a gradient towards the middle.
The flowing coloring of the Asahi figure causes the inner part of its background to be perceived as significantly brighter than the outer background, causing the pupils to constrict when looking at the central background.
For optimal effect, all petals must have the same monochrome color scheme with changes in brightness. The background can be any uniform color, but it should be as light as possible.
The illusion disappears when all petals have the same color but without the smooth transitions.[1]
