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My fav is Look to Windward, but you needed to be entrenched in the world to get a lot out of that book.

I still haven't been able to make myself finish Matter yet.

I loved Matter. It drags on for the first half (like many of his books), but once it gets started, boy does it go!

The title is awfully well chosen, too. The full title would probably be: "Matter? It doesn't"