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In the first draft script of "The Cage", the Rigel fortress was described thus; "The fortress is built from the adobe-type terrain around it, not unlike the outposts of the Earth's American West, except for strange symbols, odd decor, and unusual weaponry (catapults, lances, cross bows, abandoned bits of armor, etc.) which indicate a feudal-level civilization." In the second revised final draft script of "The Cage", it was notated that the Rigel fortress "suggests a medieval civilization, but carrying strange symbols and odd décor which suggests things quite alien from Earth." The same draft of the script similarly described the fortress' courtyard; "The feeling here is as outside, a feudal-level civilization but with its weapons and architecture somewhat different from Earth."