Refers either to condition of leaves or pages of the book; they are crisp when not dulled with handling, but also to condition of the covers, with the gilding still bright, the edges and corners of the covers sharp.
CJ grew up admiring books. His family owned a small bookstore throughout his early childhood, and he would spend weekends flipping through book after book, always sure to read the ones that looked the most interesting. Not much has changed since then, except now some of those interesting books he picks off the shelf were designed by his company!
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