Sketching the future of the Freezing Favela Share Facebook Twitter LinkedIn Pinterest E-mail Willem Velthoven discusses dimensions while standing next to the Mediamatic Fabriek maquette. With: Willem Velthoven Where was this made?: Slum Sessions #4, Mediamatic Fabriek This picture was taken at Mediamatic Fabriek during Slum Sessions #4, part of Freezing Favela.