"Now what are we looking at right here? What’s bang in the middle? Some people think that’s mathematics there. Fine. But if maths is the study that best allows you to think your way to the centre, what’re the forces you’re investigating? Maths is totally abstract, at one level, square roots of minus one and the like, but the world is nothing if not rigorously mathematical. So this is a way of looking at the world which unifies all the forces: mental, social, physical."