In a body of work that is perhaps unparalleled in history, Leonardo da Vinci’s (1452–1519) sketches and copious notes allow us to peer into the mind of a genius. He was a consummate draftsman and sketch artist, and carefully recorded his world and the travels of his mind in mirror-image cursive. A man of unquenchable curiosity spanning an infinite spectrum, he was simultaneously taken with the concepts of grace and geometric structure of the universe. In his notes on water motion and the moon he explores the intrinsic beauty of serpentine flow, valued artistically as the most graceful of figurative movements. In his diagram of the light of the moon relative to the brilliance of the sun recorded in the Codex Leicester, we are reminded of the light Da Vinci shone on humanity’s potential for greatness.