Door
Doors are a very common and useful piece of furniture. They can be made from 8 boards which need to be in the player's inventory. Doors must be built between two existing structures, e.g. between two walls or fences.
A bug in 3.11c, (confirmed in 3.13p4), allows doors to remove large rocks. By surrounding the rock with fences, then building and deconstructing a door on the rock tile, it disappears.
Doors can be [o]pened and [c]losed with their respective commands.
Doors must be closed before they can be deconstructed. Be sure to deconstruct the door before removing the adjacent walls. If you remove either adjacent wall first, you won't be able to deconstruct the door. In that case, just build a fence on top of the door, and deconstruct the fence. You won't be able to reclaim the materials that went into constructing the door using this method.