1. Department of Human Geography and Planning, Utrecht University, Utrecht, the Netherlands; and Collective Learning Group, MIT Media Lab, Cambridge, MA, USA. Now at: Collective Learning Group, Artificial and Natural Intelligence Toulouse Institute, Toulouse, France.
2. Department of Human Geography and Planning, Utrecht University, Utrecht, the Netherlands; and UiS Business School, Stavanger Centre for Innovation Research, University of Stavanger, Stavanger, Norway.