More than almost any other device, the iPad becomes the software it runs. The watch is always a watch. The phone is always pocket-sized (sort of). The iPad uniquely morphs between being a sheet music stand, an artist's easel, a book, a game, a cinema screen, a cash register, a typewriter, a notepad, a map, a project plan and a video editing suite all with a quick launch of an app. That's what makes it a special device. It's not just a “tablet computer”.