Audience at Slum Sessions #11 Audience listening to Willem Velthoven for tips and tricks Share Facebook Twitter LinkedIn Pinterest E-mail This picture was taken at Mediamatic Fabriek during Slum Sessions #11, part of Freezing Favela. With: Jans Possel, Willem Velthoven, Iren Winterkorn, Deniz, Els Engel Where was this made?: Mediamatic Fabriek, Slum Sessions #11