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I find Kahn’s almost morbid ‘dream anatomy’ very interesting. His mechanical visualization of the inner workings of the human body reminds me of a somewhat similar illustration I loved to look at when I was in the fourth grade.
I found a ‘mechanical inner man’ illustration in an old three-volume encyclopedia in the school library. It was less complicated than the Kahn poster (pictured) but as a fourth grader I was intrigued by it and often drew my own versions (wish I’d kept those drawings).
More on Kahn’s ‘body machines’ here.