Written in 1920 or 1921 first performed on June 10, 1921, next and most famously performed July 6, 1923. Modus ponens: If the purpose of Dada in general and The Gas Heart in particular was to piss people off, then both, especially the latter, succeeded marvelously. The purpose of Dada in general and The Gas Heart in particular was to piss people off. Therefore, ...