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The image on the right shows a fallacy in the Apple algorithm for shading window edges.
Shadow is not additive: objects directly in front of one another cast the same shadow, not a darker one.
The darker shadow at the upper end of the image is where the left borders of several windows coincide. The lighter part at the bottom is where only one window border remains.
The shadow should be the same all the way through.
Things get worse when even further windows are piled on top - not a particularly pretty sight.