org/wiki/Switching_station I suspect it means that things in the city come into the body and get changed/moved and put back out in the city in another place or state, and this is not like *** (moving but not moved), but body and city are interconnected (as organs and body are in the human body - here they are 'en masse' in the city). Just my quick take - someone else might chip in with an alternative! acts within = your "acts within its urban surroundings" d
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