(I) In our modern cities, we barely notice the fantastic
abundance and intensity of human-made colour. (II) Our
biological inheritance, perhaps at a subliminal level, still
causes certain colours to attract or repel us. (III) This is
perhaps because, with so much colour around us, we
have grown used to its passing pleasure. (IV) Much of
this spreading sea of colour has no real function other
than to attract attention to itself. (V) Unlike nature, where
every colour has gradually evolved over time to fulfill
some precise utilitarian purpose, we spread colour
around because we like it and we can.