I used to hang out at used bookstores regularly. Mostly to find cheap but good quality books for my kids when they were younger. I once managed to get a used copy of Paul Graham's On Lisp which was discarded from the technical library of a company somewhere.
The main point of interest is that physical items age and retain artifacts of their lives. I found a childrens book that was discarded from an American library where a girl had scrawled in pencil that she was proud that she finished it. I've seen one which was awarded to a man for being top of his class in college in the early 1900s. The bookshop I used to visit once had a book sold to him which contained a letter from Rabindrnath Tagore in the original in between the leaves of the book.
It's a fascinating feeling and quite primal.
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