Anonymous (20th century) La ley de contrarios como energia universal, 1950 Indian ink and coloured pencil on paper Titled top centre 45 x 32 cm Provenance : - Galerie Christian Berst, Paris - Acquired from the latter by the current owner Exhibition dates: - Paris, Galerie Christian Berst, "Sauvées du désastre, œuvres de deux collections de psychiatres espagnoles (1916-1965), 7 March 2015 - 11 April 2015, reproduced in the exhibition catalogue p.267 - Arles, Festival du dessin, "Sélection de dessins de la collection Antoine de Galbert", 12 April-11 May 2025, reproduced in the exhibition catalogue Bibliography: Exhibition catalogue, "Pinacoteca psiquiatricaen Espana, 1917-1970", ed. Universitat de Valencia, Madrid, 2010, reproduced p.73 A certificate of authenticity from Galerie Christian Berst will be given to the buyer.