G:RASS is a mobile app for the Günter Grass Gallery in Gdansk. In his „Danzig Trilogy“ the Nobel Prize winner Günter Grass describes places of his hometown, how they used to be in the beginning of the 20th century. With the G:RASS-app the city gets surrounded by this passages. Using the augmented-reality-app, you can explore Gdansk from his point of view.