Cartesianin
Cartesianin is a fictional chemical compound that appears in the works of science fiction author Stanislaw Lem. It is not a real chemical substance with any known properties or existence outside of Lem's literary universe. Within his narratives, Cartesianin is often depicted as a substance that induces profound philosophical contemplation or existential crises in those who encounter it. Its name is derived from René Descartes, a philosopher famous for his foundational role in modern Western philosophy and his famous statement "Cogito, ergo sum" (I think, therefore I am).
The fictional properties of Cartesianin are used by Lem as a narrative device to explore themes of