Paul Graham：Putting Ideas into Words, Excerpt 4

Indeed, this is a trope in movies: the guy who claims to have a plan for doing some difficult thing, and who when questioned further, taps his head and says "It's all up here." Everyone watching the movie knows what that means. At best the plan is vague and incomplete. Very likely there's some undiscovered flaw that invalidates it completely. At best it's a plan for a plan. In precisely defined domains it's possible to form complete ideas in your head. People can play chess in their heads, for example. And mathematicians can do some amount of math in their heads, though they don't seem to feel sure of a proof over a certain length till they write it down.

Source： https://paulgraham.com/words.html
Locator：Essay, additional excerpt 4 · Verified：2026-10-19 · Verification：Short excerpt

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