Original artwork, not a still
What I cannot create, I do not understand.
Behind the line
What it means
Our interpretation.
Understanding, for Feynman, meant being able to rebuild an idea from scratch, not merely follow someone else's derivation. People cite the line to defend learning by building: writing the program, re-deriving the equation, soldering the circuit. Because it was found on a board and not in a lecture, it has the feel of a last private note, which is much of why it spreads.
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In context
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These words were on Feynman's blackboard at Caltech at the time of his death on 15 February 1988; the Caltech Archives hold a photograph of the board. They were not a line from a talk or book, only a note left on the board, and when it was written is not recorded. Beside them was a second line about knowing how to solve every problem that has been solved. The sentence has since travelled far beyond that classroom.
Sources (1)
- Wikiquote: Richard Feynmanentry for 'What I cannot create, I do not understand'Reference checked
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