sol.id is an installation for the campus of the Swiss Federal Institute of Technology Lausanne (EPFL) that uses new computational technology to create mirror-like metal plates that direct caustic light reflections to form recognizable images. Situated on the esplanade underneath the Rolex Learning Center, the installation reveals new qualities of light with the arc of the sun – qualities that are captured in the portraits of four figures who made important contributions to several fields studied at EPFL.