According to the TARDIS information system, ambient complexity was an environmental condition which could cause a regeneration to fail. The solution to the problem of a "busy background" was, according to the information system, a Zero Room or an "eminently more effective" real, neutral location like the "habitation" of Castrovalva. (TV: Castrovalva [+]Christopher H. Bidmead, Doctor Who season 19 (BBC1, 1982).)
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Ambient complexity
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