If you can find a copy, "The Maker of Dune" gives some nice insights into Herbert's thinking. The book looks to be pretty hard to find now, though. I used to ha

If you can find a copy, "The Maker of Dune" gives some nice insights into Herbert's thinking. The book looks to be pretty hard to find now, though. I used to have a copy, but I must have sold it at some point when I was poorer. [Edit:] The internet archive has it: https://archive.org/details/the-maker-of-dune-insights-of-a-master-of-science-fiction-by-frank-herbert-tim-o-reilly https://archive.org/details/the-maker-of-dune-insights-of-a-...