Special issue of Design Issues, MIT Press, vol. 37, no. 1, edited by Davide Fornari, Robert Lzicar, Sarah Owens, Michael Renner, Arne Scheuermann and Peter J. Schneemann, with contributions by Sandra Bischler, Chiara Barbieri, Davide Fornari, Constance Delamadeleine, Robert Lzicar, Sara Zeller.