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In 1959 Hans Sonnenberg organized the ZERO exhibition in the Rotterdamse Kunstkring, with work by Manzoni, Van Bohemen, Tajiri, Wagemaker and Schoonhoven among others. A year before this, Hans Sonnenberg, who went on to become a legendary gallery owner and art promoter, had brought Piero Manzoni to the Netherlands and shown his work in Rotterdam. He had exhibited Jaap Wagemaker earlier, and in any case at that time Wagemaker was already a well-known international artist. The same could not yet be said for Jan Schoonhoven, who was then still part of the ‘Informele Groep’, together with …