I try not to let my shelves get too crammed these days, but I really could have done with something like this in the past (e.g. in the university library or when I worked in Waterstone's).
The “P-hook” has been designed by Junji Itosaki of pyloneer. They come in black or multi, but are sadly as yet only available in Japan. They enable you to hook your books out without damaging them or your fingernails. [via Apartment Therapy]
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