A Door Must Be Either Open or Shut, a play by Alfred de Musset.
I took a few photos of this old printing press at the Ecole des Beaux-Arts, last Monday. The sharp request (Shut the door; the heating is on !) in red letters was printed on a sign as big as a curtain.
The full text of Musset's plays in English is online.
On peut imaginer que bien peu d'étudiants et de visiteurs ferment la porte donnant sur le jardin...
http://www.theatrorama.com/2009/05/il-faut-quune-porte-soit-ouverte-ou-fermee/
http://www.lyc-lurcat-perpignan.ac-montpellier.fr/intra/fra/oeuvres/thea19/musset/musset_portouv.htm
