
Starts out reasonably easy to follow if you have a reasonable grasp of basic concepts in mathematics, then progressively ramps up. Unfortunately, by about halfway through the book his initially clear narrative descends into a mire of technical murkiness that's difficult to follow even with some knowledge of university-level maths because he frequently makes unnecessary/unclear/bizzarre leaps in the middle of presenting proofs/theorems/discoveries. He also forgets that describing equations and relations in words is a lot more difficult to follow than presenting the equations themselves. The pictorial representations are also usually lacking in accompanying descriptors unless you already know what he's talking about.
Pretty disappointing as he's supposed to be quite a good communicator.