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Real Secret: Unique Storage Custom Cut into Classic Books « Dornob
A book safe sounds crafty, if not entirely secure, until you realize: most of them are mass-produced, using the same book (or books) over and over again as their basis – and worse yet, the same recognizable styles and volumes. The solution is simple, and one company has executed it: collect various common and rare (real) books, hollow them out and leave a hidden compartment within. Not enough room inside a single (thick) book to suit your needs? They can be stacked, too, and then cut together to create a larger void space in the middle.