What are the birds thinking? Ponder that. Curated by Ute Meta Bauer, Amar Kanwar and David Teh, this year’s Biennial brings together projects by more than 500 contributors from around the world. There are 12 venues, spread across Beyoğlu, Kadıköy, the Old City (Fatih) and Zeytinburnu. The biennial. They can be visited free of charge until November 20.