The Fleete (canals) of Hamburg's inner city were once full of life. Today, they are mainly unused and lacking in vegetation. The designers Beate Kapfenberger and Martha Starke would like to breathe new life into the urban waterways. With the support of the Fraunhofer WKI, they are developing floating islands which can carry plants and which are made from a robust and lightweight bio-material. This consists of 100 percent renewable raw materials – including recycled balsa wood from wind turbines. Through this project, a new form of green space will be created in the city: valuable biotopes, recreational spaces and meeting places on the water.