When we think of a book, we still think of a tan­gi­ble, printed object with pages and a spine. As books become dig­i­tized in more sophis­ti­cated ways, how will the def­i­n­i­tion of “book” change? How will social read­ing, mul­ti­ple path­ways and rich media trans­form the mean­ing of the word “book”?