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Mattijn Seip studied at the Nederlandse Filmacademie in the early 1960s, and was a member of the illustrious generation of Wim Verstappen, Pim de la Parra, Adriaan Ditvoorst, and Nicolai van der Heyde. He made controversial films during that period: IJdijk and Schermerhoorn, both from 1965. In August of 1968, Seip and Niko Paape co-founded ‘STOFF’, due to their dissatisfaction with the existing subsidy regulations. They demanded more freedom, and wanted to democratize filmmaking.