Much has been made about the differing qualities of books on paper vs. tablets. However, no book has offered experiences quite as different as the recently released London Unfurled. As a book, it is an unusual specimen in that it’s made up of a 37 foot foldout of a drawing of the Thames River with opposing banks on each side of the paper. As an iPad app you can scroll through the two panoramas and tap on specific buildings for more information, including an audio guide. You can also frame sections of the drawing and mail it off as a virtual postcard. Whichever form you prefer, I think even traditional book lovers will agree that it’s easier to curl up with the iPad version.