Door (Item Subtype)

These items count toward the building block item limits in a house, but they have an interactive open-and-close function.

See the Block category page for most of the items that count toward the building block item limit.
See the Tile category page for items that look like tile, stones, or various ground-cover (leaves, sand, hay etc.) that are floor-bound by default when placed normally in a house or guild hall.