53's app, called "Paper", is a stack of Moleskins, a handful of drawing tools and a small array of colors. It isn't for creating finished work or storing a gallery's worth of masterpieces locally on your iPad. The app is for a different kind of work, the sort one does before they really get to work.
If you've ever used a pen you lifted from the hotel you're staying at to jot down an idea on a napkin, this is app is for you. If you've ever grabbed the crayons from the table at the pizza place to entertain yourself by drawing on the back of a kid's menu, this app is right up your alley. The promotional video shows someone using their iPad to jot down items while wandering the city.
If you're the sort of creative person who has their best ideas no matter where they happen to be, check this app out. It's free, and you can try out the features before you buy any of them.