Comprising nineteen black and white photocopied images, this documentary artist’s booklet was printed immediately after the realisation of Erosion, an unannounced intervention during the 2nd Johannesburg Biennale, South Africa, in 1997. Here, Eliasson organised the emptying of a water reservoir, located opposite the exhibition hall in which one of his photo series was on show. The water turned into a stream, running approximately 1.5 km through the city, carrying dirt, leaves, and litter with it before disappearing into a sewer. People in the city were forced to navigate the change to their urban environment, which lasted for about three hours.