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This is a long shot, but wondering if anyone can help. Trying to recall a sci-fi author. One of his books was about a world that was all vertical, people lived on this eternal cliff (I think they caught up-draughts and down-draughts to go up and down the cliff).
Another story by the same author was about a criminal who was imprisoned in a giant, inescapable structure in distant space (I think that had a red cover).