With the theme of 'Urban by Nature', the sixth edition of the International Architecture Biennale Rotterdam opens in May 2014 in the Kunsthal in Rotterdam. With Dutch landscape architect Dirk Sijmons as the curator, IABR is calling for best practices from all over the world to support and substantiate the Biennale’s main exhibition’s narrative. Prospective participants who have designed or are designing concrete projects that deal with the relationship between man, nature and city, are invited to submit their applications by June 9, 2013. For more information, please visit here.