There’s a great movie version of it from the 80s by David Lynch. Not so good if you haven’t read the book but I found it oddly, perhaps uniquely, sublime representation of the book after having read Dune. I don’t think I’ve ever experienced art like that where it changed so much after experiencing the source material or some other piece.

It was like a private key/ public key where you need both pieces to match in order to work. (Although I think the book is excellent by itself)

I was enjoying Dune and I got through the sequel which was ok, but I'm not really getting on with the 3rd book (children on dune) I've only managed to get through a few pages. I think all of these books are reasonably slow going from my perspective but I can't quite put my finger on it.