"The word aesthetic derives from a Greek root meaning sensitive, which derives in turn from a verb meaning to perceive. The more sensitive we are, the more we may be nourished by what Robinson Jeffers called 'the astonishing beauty of things.' Anyone can take delight in a face or a flower. You need training, however, to perceive the beauty in mathematics or physics or chess, in the architecture of a tree, the design of a bird's wing, or the shiver of breath through a flute. For most of human history, that training has come from elders who taught the young how to pay attention."