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I think its an association with the colours of nature, to some extent. Vivid yellows, reds and greens are often a warning 'I'm poisonous' in the animal world. Soft colours seem to say someting else. Blue suggests cold, perhaps because of the blue tinge often seen in snow and ice. Red suggests danger, perhaps because of the colour of hot embers. Green is said to be calming, this may be because of the colour of plant leaves. It is always said that a restaurant should not be decorated in greens, because the clientele will feel too relaxed and won't bugger off after they have stuffed their big fat gobs.