The time has come to attempt some conclusions about what it is, precisely, that quantum mechanics tells us about the world. This isn’t an easy task, because quantum mechanics is not conceptually clear, and its true meaning remains controversial; but it’s a necessary exercise, to gain clarity and go forward. I think that quantum mechanics has revealed three aspects of the nature of things: granularity, indeterminacy, and the relational structure of the world. Let’s look at each of these more closely.
