To engage in Istanbul implies dealing with many open questions. One example is the difficulty of defi- ning public space due to complex historical conditioning and diversity. Different life forms and opposites exist in parallel; the historical and the contemporary city, tradition and modernity, periphery and centre. PUBLIC IDEA is linked to preliminary discussions concerning urbanism and transformation processes in a metropolis. The main focus is placed on the artists’ perspectives and personal approaches towards the city. Edited by Antje Feger and Benjamin F. Stumpf. Published by Revolver Publishing, Berlin, in 2011.