Your spellbook exists simultaneously on the Ethereal and Material Plane. The spell requires an expertly crafted miniature replica of your library, constructed by a carpenter, dollmaker or toymaker with no fewer than 8 ranks in her particular craft. The replica must include furniture and its materials cost no less than 5,000 gp. Once finished, you begin casting the spell. Ethereal library creates miniature copies of the books that then appear in the corresponding location in the replica. The replica along with the duplicates vanishes into the Ethereal plane. Meanwhile, the copies of the books remaining on the Material plane appear blank to everyone else but you. The effect can be removed by a dispel magic, returning the books to their normal state, or seen through by true seeing, enabling the caster to read the books normally. When the spell expires, the replica returns to the Material Plane, and the books resume their original appearance. The replica can be used multiple times, however the chance of permanently losing the library and its contents on the Ethereal plane cumulatively increases by 1% per usage.