- Structures spanning and providing passage over waterways, topographic depressions, transportation routes, or similar circulation barriers.
- Barriers to confine, control, or obstruct the flow of water.
- Individual dwellings designed to be occupied by a single tenant or family. May also refer to a building for human occupation, for some purpose other than that of an ordinary dwelling; with this usage, "house" is generally prefaced (e.g., "cowhouse," "almshouse").
- Boats having sails as their primary means of propulsion.
- Creative works that depict the ocean or other large body of water where the water itself dominates the scene. When lesser bodies of water are depicted, use "landscapes (representations)." When ships, shipbuilding, or harbors are depicted, use "marines (visual works)."
- Buildings or devices with sails or vanes that turn in the wind and generate power. The devices operate by means of a rotating shaft on which sails are mounted or placed at an angle so that the force of wind against them causes rotation, which in turn produced energy. Windmills were historically used chiefly in flat districts for operating a mill to grind grain or pump water; the older and most characteristic European form consists of a conical mill-house with a dome or cap supporting four sails. Modern devices tap the wind to produce electricity by using a disk of sails mounted on a framework.
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