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“Maybe it’s the underground setting that makes it possible – you can get away with almost anything in the dark? Or perhaps it’s the element of speed – most stations race by outside the window and to be noticeable calls for spectacular gestures? Or perhaps the striking creativity is quite simply to do with the fact that these cavern stations are hollow spaces, instances of negative space as opposed to positive, subtraction instead of addition, where all the practical and aesthetic considerations that you otherwise have to acknowledge have no relevance here?”