Huedoku color puzzle, Sudoku but Without Numbers
illustratively revealing one biologically notable truth: perception is hardwired to enhance contrast.
Not only is paying attention to color useful — it’s an immediate reminder of how perception is limited and always biased.

Twenty-five colors are created and perfectly arranged within a frame. In this world of perfectly related colors, four corner colors become the primaries. The primary colors derive every other color. The relationship among each box of color is made distinct, the ordered solution is intuitively harmonious.
Colors in order
Twenty-five distinct fields of color are contained and placed right up against each other, made adjacent, resulting in a dramatic visual effect. Each box is a solid color, deliberately made the color blend in equal relationship to its immediate neighbor colors. The border edge is crisp and the rest of the box appears to actively blend, like how in every room of white walls the corners always look extra painted. It’s like a different kind of blend. It looks like a gradient. It’s as if the contrasted adjacent color has enchanted its neighbor.
What we actually see instead of solid blocks of equal color is an illusion of millions of colors smoothly enhancing the edge of visual contrast. Overly familiar with this optical effect we rarely note its oddity.
The game is to put the colors back in order, in a way you know looks right but you can’t really explain in words.
