As yellow is always accompanied with light, so it may be said that blue still brings a principle of darkness with it. This colour has a peculiar and almost indescribable effect on the eye. As a hue it is powerful — but it is on the negative side, and in its highest purity is, as it were, a stimulating negation. Its appearance, then, is a kind of contradiction between excitement and repose. Johann Wolfgang von Goethe, Theory of Colours
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