“Salopes ou le quart heure de rage au soleil” by Paul Joostens
Part of the fun of having my own wiki is being to able to trace the things I find in intimate detail and thus not only arriving (as in this case) at the Antwerp underground, the Belgian avant-garde and abstract art in Belgium but eventually arriving at a European and even worldwide encyclopedia of the avant-gardes.
What came before.
Ca Ira! was an Antwerp based Belgian publisher who published Clément Pansaers‘s L’apologie de la paresse  in 1922. The title Ça ira comes from a song of the French Revolution (Ah! ça ira, translated as: “We will win!”).
Ca Ira! also published work by Paul Neuhuys, Han Ryner, Paul Colin, Céline Arnauld, Picabia, René Arcos, Wies Moens, Charles Plisnier, Romain Rolland, Theo Van Doesburg, Stendhal, Pascal Pia, Renée Dunan, Frans Masereel, Piet Mondriaan, André Salmon and Jean Cocteau.
Ca Ira! was also the title of a monthly magazine that featured avant-garde art, literature and politics. It was founded by a group of young artists, who came out of the smoking war-wrecked world of 1919 with a new élan. Twenty editions were published between April 1920 and January 1923 under the direction of Maurice van Essche, Paul Neuhuys and Willy Koninckx.
The members (many of whom later achieved great fame and notoriety) included Paul Colin, Theo van Doesburg, the young poet Maurice Van Essche, Abel Lurkin, Paul Neuhuys, Arthur Pétronio, Charles Plisnier, Han Ryner, while very appealing dada and expressionist woodcuts and linotypes were added by Floris Jespers, Paul Joostens, Frans Masereel, Jan Cockx, Jozef Cantré, Karel Maes and Jozef Peeters. One finds incidental contributions by Paul Van Ostaijen, Paul Éluard, Francis Picabia, Ezra Pound, Iwan Goll, Blaise Cendrars and Lajos Kassák.