The earliest recorded doors appear in the paintings of Egyptian tombs, which show them as single or double doors, each of a single piece of wood. Doors and doorways frequently appear in literature and the arts with metaphorical or allegorical import as a portent of change. Receiving the key to a door can signify a change in status from outsider to insider.
(In some countries, such as Brazil, it is customary to clap from the sidewalk to announce one's presence.) Apart from providing access into and out of a space, doors may have the secondary functions of ensuring privacy by preventing unwanted attention from outsiders, of separating areas with different functions, of allowing light to pass into and out of a space, of controlling ventilation or air drafts so that interiors may be more effectively heated or cooled, of dampening noise, and of blocking the spread of fire.ĭoors can have aesthetic, symbolic, ritualistic purposes. Doors may have devices such as knockers or doorbells by which people outside announce their presence. Many doors incorporate locking mechanisms to ensure that only some people can open them (such as with a key). But in other cases (e.g., a vehicle door) the two sides are radically different. In most cases, a door's interior matches its exterior side. The door may be able to move in various ways (at angles away from the doorway/portal, by sliding on a plane parallel to the frame, by folding in angles on a parallel plane, or by spinning along an axis at the center of the frame) to allow or prevent ingress or egress. Doors are commonly attached by hinges, but can move by other means, such as slides or counterbalancing. Doors are generally made of a material suited to the door's task. Conventionally, it is a panel that fits into the doorway (portal) of a building, room, or vehicle. A door's essential and primary purpose is to provide security by controlling access to the doorway (portal). The created opening in the wall is a doorway or portal. A few examples of doors throughout the worldĪ door is a hinged or otherwise movable barrier that allows ingress (entry) into and egress (exit) from an enclosure.
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