Constructivist-Congress at Weimar : 1922

from left to right / from back to front :
                                   Lucia & László Moholy-Nagy 
Max & Lotte Burchartz, Peter Röhl, Hans Vogel     Alfred Kémény
                       Alexa Röhl                Bernhard Sturtzkopf
                          El Lissitzky, Nelly & Theo van Doesburg
Werner Graeff, Nini Smit, Harry Scheibe,
        Cornelis van Eesteren, Hans Richter, Tristan Tzara, Hans Arp