PERSON
Susanne Langer
The logician-turned-philosopher of mind who established that human beings operate through two irreducibly different symbolic modes—discursive and presentational—and whose framework has become the most precise instrument available for understanding what artificial intelligence can do fluently and what it structurally cannot do at all.
Susanne Katherina Langer is the philosopher the AI age did not know it needed. Trained as a logician under Alfred North Whitehead at Radcliffe and spending decades at Connecticut College and Columbia University, she applied the precision of formal analysis to the territory that logic had written off as mere emotion—music, visual art, ritual, felt experience—and found there a second symbolic mode, entirely distinct from language, which she called
presentational symbolism. Her 1942 book
Philosophy in a New Key sold over half a million copies and was translated into dozens of languages before being largely forgotten by the academic mainstream. The forgetting was a mistake. The distinction she drew between discursive symbols (sequential, decomposable, combinable by rules) and presentational symbols (simultaneous, holistic, meaningful as wholes) is the single most clarifying framework for understanding what
large language models do and what they cannot do. A language model operates entirely within the discursive mode—processing