I'm not sure it works well for fiction. I put in a few different sets of science fiction works ranging from Heinlein to Atwood and it returns about half comic books, a significant number of fantasy/sci-fi works, and a smatter of other things. Oddly, it includes children's books I've read to my kid.

My bubble very much includes both Dune and The Far Side and I'm not certain how these are supposed to be in different bubbles. Are most Dune readers snobs who wouldn't stoop to reading a cartoon?