Why is purple just so fabulous?

There’s a moment in Alice Walker’s wonderful novel 'The Colour Purple' when the main character, Celie, identifies the colour purple as incontrovertible evidence that God is good:

‘I think it pisses God off when you walk past the color purple in a field and don’t notice it. 

People think pleasing God is all God cares about.  But any fool living in the world can see it is always trying to please us back.’

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