Today, I walked into a very dark room, let my eyes adjust, and then marveled at 22 pages from Leonardo da Vinci’s “Codex Atlanticus”. His original drawings. I saw his mind working. Observed his mulling things over. enjoyed the surety of his hand and his line. To be in the presence of the evidence of the man: artist, engineer, philosopher. A building is an even more tangible relic of a person’s life, but handwriting and a pondering line are more intimate.