Locks are one of those technologies of which I have a theoretical understanding but had never seen in action until the other day.The Ballard Locks, I learned, carry more boat traffic than any other locks in the country, so there's a good chance you'll see a ship pass through this engineering marvel.
To witness a craft at eye level and then, only a few minutes later, see it 25 feet lower ... well, let's just say it reminds me, once again, of the power of showing over telling.