As I was sailing with a good friend on an ocean that was calm and as flat as glass, I felt I couldn’t have asked for a more peaceful morning. But after my friend (the captain of the ship) checked a small digital gauge on the boat, he sprang to the till to change direction. He informed me that despite the serene appearance of the water, the bottom of the ocean was remarkably shallow where we were sailing. Thanks to the boat’s depth finder, we had just barely escaped getting the boat’s six-foot-long keel caught on a rocky formation. As I shook my head in amazement, he told me that the greatest dangers in sailing are not the threats you can see, but those you can’t.
During a visit to an art institute, I observed a German suit of armor made in 1521. None of the other defensive ensembles seemed as complete as this one. It featured vented metal to cover the face; a curved breastplate to deflect blows; metal that continued down the arms, hands, and covered each finger; leg shields that were seamlessly fitted to metal shoes. The craftsman had imagined every possible offensive strike and addressed each in his design.