“It is to be emphasized that no matter how many [amplitude] arrows we draw, add, or multiply, our objective is to calculate a single final arrow for the event. Mistakes are often made by physics students at first because they do not keep this important point in mind. They work for so long analyzing events involving a single photon that they begin to think that the arrow is somehow associated with the photon”

— Richard Feynman , book QED: The Strange Theory of Light and Matter

rather than with the event
Source: QED: The Strange Theory of Light and Matter (1985), p. 75-76

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Richard Feynman 181

American theoretical physicist 1918–1988

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