On May 15-16, 2013 the 5th International Daylight Symposium, themed « New Eyes on Existing Buildings » and organized by Velux, took place at the Royal Academy of Arts in Copenhagen, Denmark. It was preceded by the 2nd Academic Forum for PhD students working on daylighting issues on May 14. Prof. Marilyne Andersen, head of the LIPID laboratory at EPFL, was invited as moderator for the whole symposium and as leading scientific researcher for the Academic Forum.