I’ve seen a bit about this book mentioned in the article linked to below. Apparently you buy the book and when you unwrap it the ink begins to fade away. After two months there is no ink left. What do you think of this gimmick? 

For more visit:
http://www.odditycentral.com/news/the-book-that-cant-wait-literally-disappears-if-you-put-it-down.html