▁door ▁can ▁sign ify ▁a ▁change ▁in ▁status ▁from ▁out s ider ▁to ▁ins ider . ▁Do ors ▁and ▁door ways ▁frequently ▁appear ▁in ▁literature ▁and ▁the ▁arts ▁with ▁met ap hor ical ▁or ▁alleg or ical ▁import ▁as ▁a ▁port ent ▁of ▁change . ▁ ▁History ▁▁ ▁The ▁earliest ▁in ▁records ▁are ▁those ▁represented ▁in ▁the ▁paint ings ▁of ▁some ▁Egypt ian ▁tomb s , ▁in ▁which ▁they ▁are ▁shown ▁as ▁single ▁or ▁double ▁doors , ▁each ▁in ▁a ▁single ▁piece ▁of ▁wood . ▁Do ors ▁were ▁once ▁believed ▁to ▁be ▁the ▁literal ▁door way ▁to ▁the ▁after life , ▁and ▁some ▁doors ▁leading ▁to ▁important ▁places ▁included ▁designs ▁of ▁the ▁after life . ▁In ▁Egypt , ▁where ▁the ▁climate ▁is ▁intens ely ▁dry , ▁there ▁was ▁no ▁fear ▁of ▁their ▁war ping , ▁but ▁in ▁other ▁countries ▁it ▁was ▁necessary ▁to ▁frame ▁them , ▁which ▁according ▁to ▁Vit ru vi us ▁( iv . ▁ 6 .) ▁was ▁done ▁with ▁st iles ▁( se a / si ) ▁and ▁rails ▁( see : ▁Frame ▁and ▁panel ): ▁the ▁spaces ▁en closed ▁being ▁filled ▁with ▁pan els ▁( t ym p ana ) ▁let ▁into ▁gro ov es ▁made ▁in ▁the ▁st iles ▁and ▁rails . ▁The ▁st iles ▁were ▁the ▁vertical ▁bo ards , ▁one ▁of ▁which , ▁ten oned ▁or ▁h ing ed , ▁is ▁known ▁as ▁the ▁h anging ▁st ile , ▁the ▁other ▁as ▁the ▁middle ▁or ▁meeting ▁st ile . ▁The ▁horizontal ▁cross ▁pieces ▁are ▁the ▁top