CONCEPT
The Paper-Knife Illustration
Sartre's 1946 illustration of an object whose essence precedes existence — the artisan conceives the knife before making it, and the concept determines the thing.
In his 1946 Paris lecture, Sartre reached for the most mundane object he could find — a paper-knife — to introduce the most radical claim in modern philosophy. The paper-knife exists because an artisan first conceived of it: its purpose, design, and manufacturing formula preceded any physical instance. Its essence precedes its existence. One cannot imagine producing a paper-knife without knowing what it is for. Sartre used this ordinary tool as the foil against which to establish the opposite condition for human beings: no artisan, no blueprint, no concept of 'human being' that precedes actual human beings. Existence precedes essence. The illustration's power lies in its mundanity — the claim that separates humans from paper-knives shatters three centuries of essentialist philosophy.
In The You On AI Field Guide
The paper-knife enters Sartre's 1946 lecture Existentialism Is a Humanism as a deliberately modest instrument. By choosing the most ordinary tool at hand, Sartre ensured that his audience could not mistake the example for a special case. Every manufactured object