ocr: cover image Detail) from. Self Portrait: The Consturctor, ElLissitaky, 1924 background image Multiplying or Dividing Machine, Otto Steiger, Patent document, 1895. Sponsored by ACM SIGGRAPH 1515 Broadway, 17th Floor New York, New York 10036 USA +1.212.616.0500 +1.212.764.5537. fax