Perhaps the leading use of blue on websites has to do with the psychology of the colour. It is known that in dreams blue is a recurring phenom associated with comforting authority, and is often dominant in sleeping dreams, day dreams, and vivid externalized images (apparitions, hallucinations). I have had dreams of my mother coming from the Interim State (I'm of Reformed Christian tradition, where "Heaven" is only a metaphor for the Interim State before the Resurrecton of the Body), and mostly attired in blue. Also, this kind of phenom is associated with appearances of the Blessed Virgin in Roman Catholic and Orthodox traditions.
Not just any blue will do, however. This comfort/authority deeply-embedded psychic phenom is more a sky-blue, not very dark, not very pale, not luminescent. [By "psychic," I don't limit myself to the more esoteric element, but indicate the whole spread of these types of phenom; I avoid "psychological" because that precisions a reference to the scientific study of such phenoms.]
Orange is another matter; and I wonder if anyone out there has any knowledge of its semiotic values, psychic and otherwise.
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