I feel like this might be a required but insufficient condition for what Bob has achieved here. With both of his books, he has taken a somewhat dry topic (obje

I feel like this might be a required but insufficient condition for what Bob has achieved here. With both of his books, he has taken a somewhat dry topic (object oriented patterns, and now compilers / interpreters), and turned them into books anyone can understand. More importantly, he has somehow made them interesting, in a way that I have rarely seen before. I suspect you're right, the focus probably helps with the process of distilling the core concepts (which are necessary to convey meaning), as well as the writing style. Picking the right analogies, the right illustrations, then executing them to perfection. I guess the passion for the topic shines through in his writing. Massive congrats to Bob!