Dan has recently discovered the joy of reading, rejoice! What's more, he seems to like off-kilter science fiction like Slaughterhouse 5, and the works of Haruki Murakami. I thought he might like it if the GB community gave him some recommendations.
I'll start by recommending Valis by Philip K Dick. Dan seems to like postmodern science fiction stories so far, and Dick is one of the best in the genre.