What is a boat?

Image credit Surf Gear Ltd http://www.cheapsurfgear.com/blogs/surf-news

“A boat, by God, its just a gleamin’ beautiful creation.
And when you pull the sail up on a boat, you’ve got a
little bit of really somethin’ God-given. Man, it goes
bleetin’ off like a bird wing, you know, and there’s
nothin’ else like it.”

Clark Mills, designer of the Optimist