The ceiling of the conference room (photo, courtesy of A. Bassi).
A typical discussion between a medical physicist (P.G.S. Cirrone), an astroparticle physicist (P.S. Marrocchesi) and an high-energy physicist (F.-L. Navarria) over a delicious lunch break provided by the staff of the Certosa di Pontignano, University of Siena (photo, courtesy of A. Bassi).