The theory of externism is described in a monologue by a Cimrmanologist having a lecture on Jára Cimrman's significance in the field of philosophy in the first act of the theatre play Akt (The Nude) by Zdeněk Svěrák, Ladislav Smoljak and Jiří Šebánek.
The play "Akt (The Nude)" features a lecture on Jára Cimrman's philosophy and its connection to the theory of externism.