" The human mind and the peacock’s tail may serve similar biological functions. The peacock’s tail is the classic example of sexual selection through mate choice. It evolved because peahens (female peacock) preferred larger, more colorful tails. Peacocks would survive better with shorter, lighter, drabber tails. But the sexual choices of peahens have made peacocks evolve big, bright plumage that takes energy to grow and time to preen, and makes it harder to escape from predators such as tigers.
The human mind’s most impressive abilities are like the peacock’s tail: they are courtship tools, evolved to attract and entertain sexual partners. By shifting our attention from a survival-centered view of evolution to a courtship-centered view, I shall try to show how, for the first time, we can understand more of the richness of human art, morality, language, and creativity. "

― Geoffrey Miller , The Mating Mind: How Sexual Choice Shaped the Evolution of Human Nature