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{{Era|Forerunner|Covenant|Human|UNSC|HCW|Post}} | {{Era|Forerunner|Covenant|Human|UNSC|HCW|Post}} | ||
{{SeeWikipedia}} | {{SeeWikipedia}} | ||
[[ | [[File:Frunner_door_common.jpg|thumb|250px|right|A common type of Forerunner door.]] | ||
'''Doors''' are movable barriers used to cover up openings; typically, such barriers are attached to the very openings they block. | '''Doors''' are movable barriers used to cover up openings; typically, such barriers are attached to the very openings they block. Doors are a basic component of architecture among all known major civilizations. | ||
== Background == | == Background == | ||
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==Sources== | ==Sources== | ||
{{Images link|Images of doors}} | {{Images link|alt=Images of doors}} | ||
<references/> | <references/> | ||
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*[[Blast door]] | *[[Blast door]] | ||
*[[Energy barrier]] | *[[Energy barrier]] | ||
*[[Porta]] | *[[Porta]] | ||
*[[Piston]] | *[[Piston]] | ||
[[Category:Buildings and structures| ]] | [[Category:Buildings and structures| ]] |