Fearsome sawblades spinning, Pretty Hate Machine menaces the competition at Robot Wars, a two-day festival of mechanical destruction at San Francisco's Fort Mason Center. Organized by Marc Thorpe, a former Industrial Light and Magic model builder, the cybernetic slugfest spawned a six-week BBC-TV series and many similar events. Pretty Hate Machine is a middleweight-class machine; two wheelchair motors power a Rube Goldberg assembly of rods, rubber belts and saw blades. A real crowd-pleaser, Pretty Hate Machine was one of the few walking robots in a competition dominated by wheeled or tracked machines. California. From the book Robo sapiens: Evolution of a New Species, page 200-201.