A nice design feature of subway turnstiles in Japan is that they are open by default. They only close if you try to pass through without a ticket. Subjectively, it conveys trust. Objectively, it probably results in less maintenance because the parts move much less frequently. 
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(The general shape is "For an X brand machine, the top right corner of the display is actually paper. Stick any sharp instrument through it, then pull forward with moderate force. The front display will come off, exposing the cans. Take what is necessary.")
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I would pay $$$$$ for a book on this topic. Best coffee table book ever IMO.
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