I am also convinced, but cannot prove, that there are no objects, but only relations.  By this I mean that I am convinced that there is a consistent way of thinking about nature that refers only to interactions between systems and not to states of or changes in individual systems. I am convinced that this way of thinking of nature will end up to be the useful and natural one in physics. Carlo Rovelli, physicist, Institut Universitaire de France and Université de la Mediterranée; author of Quantum Gravity. Edge Foundation