"Variability, one of the chief determinants of evolution, is greatest in structures that evolve fastest. In humans, the brain is the most variable and fastest evolving organ. Variability confers huge advantages: it enriches our cultures immeasurably and is a key factor in the further evolution of human societies. Yet, as an evolutionary imperative, it also exacts a high price. It is often the cause of serious injustice and marginalizes from society those whose conduct or inclinations are judged to be deviant from the norm. Paradoxically, this may benefit art and hence contribute to cultural evolution."
Semir Zeki