Barney Saltzberg's Beautiful Oops, short version
A life lesson that all parents want their children to learn: It's OK to make a mistake. In fact, hooray for mistakes! A mistake is an adventure in creativity, a portal of discovery. A spill doesn't ruin a drawing—not when it becomes the shape of a goofy animal. And an accidental tear in your paper? Don't be upset about it when you can turn it into the roaring mouth of an alligator.