Vierhavensblok is an industrial port area in transition where creatives and entrepreneurs feel at home. The challenge is to develop a vision for the site that shows which of the eight leading principles for sustainable area development can be organized collectively. How can the site be densified with new circular building blocks where working and living meet? What is the right scale for such circular infrastructures? Submitters should come up with a strategy for a phased development in which affordability and the existing collectives of Vierhavensblok and their initiatives are included.