All important themes of Dune by Frank Herbert
There are quite a few important themes in Dune: A deep respect for Ecology (Sandtrout -> Sandworms -> Spice -> Sandtrout...). The importance of perceiving the underlying worm/spice life cycle is echoed in nearly every other plot element in the series as well. "Bio-tech" in the shape of complex human systems - there are no technological wonders in the Dune universe akin to most sci-fi. Everything important, from mentats, genetic programs and even prescience and to a degree space folding is predicated on tapping human mental ability and control. Manipulation of historical forces - just as the Landsraad and Harkonnen especially were held in check via Shaddam's political maneuvering, the intense religious fervour that is part-in-parcel with the unforgiving Fremen life on the sands is similarly exploited by Paul and Jessica. Plans within plans abound and the upshot of this is that Dune proposes that just as the spice does not emerge in a vacuum, neither does...