A metaphor for the best writing tip I've heard

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Writing never comes easy to me. Oftentimes my procrastination is fueled by the anxiety I feel when I need to sit down and write a manuscript. During my PhD I heard this great writing tip that really stroke a chord within me, but only a few days ago I came across a tweet by David Perell with a very eloquent metaphor that illustrates that writing tip.

Perell: How should you write? Skip the Printer Method and choose the Pixel Method instead.