Each bar is a “color trend timeline” showing what colors were used for the books’ covers over the years. The longer a certain cover was in print, the more space Buxton gives it on the timeline. As for the individual covers: Buxton reduced each one to its five most common colors, then gave those colors space that is directly proportional to how prominently they figured on the cover. And there’s some interesting stuff here! There was a dijon-mustard edition of The War of the Worlds that lasted for decades. Philip K. Dick’s The Man in the High Castle had a brief fling with a rainbow palette. Red and eggshell-white were apparently big mid-century choices. It’s enough to make you want to track them all down.
