Creating a New Yorker Cover On the iPhone

Jaime Leifer writes "The cover of the June 1, 2009, issue of The New Yorker, entitled 'Finger Painting,' was drawn by Jorge Colombo entirely on his iPhone — a first for the magazine. Colombo, a New York-based artist and illustrator, uses the iPhone's Brushes application to vibrantly depict New York street scenes." There's a video recapitulating the creation of the piece, omitting all of the undos.