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Wikipedia There is more information available on this subject at Doors on the English Wikipedia.
Frunner door common

The most common type of door seen in the Halo games.

Doors are movable barriers used to cover up openings; typically, such barriers are attached to the very openings they block. They are used by virtually all factions in the Halo Universe.


Like all technology created by the various factions of the Halo Universe, the doors they create for various purposes represent their general design styles in many ways.


The Covenant frequently use curves as well as bright purples, blues, and grays in the design of their technology; everything from weapons to cities. The doors incorporate the curves and colors standard to Covenant design, most notably in High Charity. While many doors throughout the Halo Universe have indicator lights and work by sliding in and out of the walls, only the doors in High Charity flash when the player gets close and emit a tone.[1][2][3]


Human technology for doors has progressed since the modern era. While most doors today are based on a hinge system, the doors seen on Earth are almost exclusively sliding (except for the antiquated doors in Crow's Nest),[4] either opened by proximity or a switch located on the door itself. Like most human technology applied to everything from roads to spacefaring military vessels, the design is simple and geometric (with some discrepancies) with straight lines and angles, and involves blacks, grays, and browns. Most doors have a light on them that is either green to indicate that it is open or can be opened, or red to indicate that it is locked.[5][6][7]


Doors built by the Forerunners are completely geometric and incorporate the similar light grays, browns, and blues of the rest of their technology. The doors themselves are geometric and often slide in multiple parts. They also have complex and geometric designs on them, it is often patterned. This same trend can be seen on floors of Forerunner structures.[8][9][10][11][12][13][14]


While the Flood do not have what is consider conventional architecture, they build their structures out of biomass they have consumed. Their doors, called Portas, are built from biomass of infected hosts, and resemble valves like those in the heart. They open based on proximity. While the sections of the door itself retract, the circular frame of the door contracts at the same time. This effect was most likely added by Bungie to make the player feel as if they were playing inside a living thing during the level, and add effect to the level.[3][15]




  1. Halo: Combat Evolved, level The Truth and Reconciliation
  2. Halo 2, level Gravemind
  3. 3.0 3.1 Halo 3, level Cortana
  4. Halo 3, level Crow's Nest
  5. Halo: Combat Evolved, level The Pillar of Autumn
  6. Halo 2, level Cairo Station
  7. Halo 3, level The Storm
  8. Halo: Combat Evolved, level The Silent Cartographer
  9. Halo: Combat Evolved, level Assault on the Control Room
  10. Halo 2, level The Arbiter
  11. Halo 2, level Delta Halo
  12. Halo 2, level Uprising
  13. Halo 3, level The Ark
  14. Halo 3, level The Covenant
  15. Halo 3, level Isolation

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