“Those accustomed to doodling on scrap paper know this: the bliss ends the moment you stop, study the result, and decide to trash it. (The alternative being, after an embarrassingly prideful assessment, not doing that.) But who bothers with scrap paper anymore? With any number of apps, you can doodle on a screen, in infinite colors, with your index finger. You can erase smoothly and cleanly, in a way that is satisfying and therapeutic. You can start over, draw new lines. No self-doubt, no paper cuts. When the picture is done, it floats away into the cloud.”