A capacity crowd is expected for a special reading at the Walker Art Center in Minneapolis tonight. Writer Neil Gaiman and artist Dave McKean are one of the hottest teams in the comic book world. McKean combines painting, drawing, photography, and collage to create disturbing off-kilter images that complement Gaiman's brand of fantasy fiction. In a collaboration that's lasted 20 years so far, they have worked on the award-winning Sandman comic book series, several graphic novels, and four children's books. They have also made a film, "Mirrormask," which Gaiman wrote and McKean designed and directed. Both men are English, but Gaiman lives in the US and McKean in Britain.