You don't really know a boat until she's hauled. Plying her trade on the water, her best half's submerged out of sight. We think we recognize her - "oh, there's Odin," or "Shelby Rose," or "Twintube" - but what are we seeing? The lines of the deckhouse, the shape and placement of the wheelhouse, the arrangement of the stacks? These are the parts known as the superstructure - "super," in this case, meaning simply "upon." It's a little like saying we recognize someone by his hat. The boat's defining structure starts at the main deck and goes downward from there. What little we see of it is low on the horizon. There's the deck's line, along with a smattering of bulwarks.