2 EnricoBeltrametti 1andJean-MarcLevy-Leblond 1Dipartimentodi Fisica, Universitadi Genova ViaDodecaneso33,1-16146 Genova, Italy 2physiqueTheorique, Universitede NiceSophia-Antipolis Pare Valrose, F-06108 Nice Cedex, France As customary, the idea of this meeting was born out during another one. The present authors were attending some colloquium among the numerous meetings devoted to the endless discussion of the foundational problems of quantum theory, when it struck their minds that physics, after all, was also an experimental science. Maybe, they thought to themselves, our very understanding...