If anything, you should cultivate dissatisfaction. In Leonardo’s drawings there are often five or six attempts to get a line right. The distinctive back of the Porsche 911 only appeared in the redesign of an awkward prototype. In Wright’s early plans for the Guggenheim, the right half was a ziggurat; he inverted it to get the present shape. Mistakes are natural. Instead of treating them as disasters, make them easy to acknowledge and easy to fix. Leonardo more or less invented the sketch, as a way to make drawing bear a greater weight of exploration. Open source software has fewer bugs because
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