Analog robot
An analog robot is a type of robot which uses analog circuitry to go toward a simple goal such as finding more light or responding to sound. The first real analog robot was invented in the 1940s by William Grey Walter. The name of these robots were ELSIE and ELMER (Electro Mechanical Robot). The original circuitry was developed using two vacuum tubes and a photocell to search and follow a light. Recently a kind of analog robots was developed by Mark Tilden.
Science fiction film
Robots have been a part of science fiction since the Czech playwright Karel Čapek coined the word in 1921. In early films, robots were usually played by a human actor in a boxy metal suit, as in "The Phantom Empire", although the female robot in "Metropolis" is an exception. The first depiction of a sophisticated robot in a United States film was Gort in "The Day the Earth Stood Still".