Relational quantum mechanics: Rovelli's world

carlo rovelli's inspiring relational quantum mechanics serves several aims at once: it provides a new vision of what the world of quantum mechanics is like, and it offers a program to derive the theory's formalism from a set of simple postulates pertaining to information processing. i propose here to concentrate entirely on the former, to explore the world of quantum mechanics as rovelli depicts it. it is a fascinating world in part because of rovelli's reliance on the information theory approach to the foundations of quantum mechanics, and in part because its presentation involves taking sides on a fundamental divides within philosophy itself.