Dune by Frank Herbert. This is a book I first read as a young teenager, but every time I re-read it every few years at a somewhat different point in my life, I

Dune by Frank Herbert. This is a book I first read as a young teenager, but every time I re-read it every few years at a somewhat different point in my life, I get a different sense of it, maybe more based on where I am in my life and what is going on in the world. That for me is what makes a book endlessly re-readable: you always find something new in it. It is packed with all kinds of references and allegories to so many parts of our world, but in a way that still seems like its own world.