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Ames Research Center. Aerospace engineer Paul Kutler, working with a 3D model on an early computer at NASA's Ames Research Center, California, USA. He is using the IBM 2250 Graphics Display Unit. The light pen is connected to the computer by a long cable and serves as a pointing device in a similar manner to a computer mouse.Photographed in 1973. (KEYSTONE/SCIENCE PHOTO LIBRARY/NASA/SCIENCE PHOTO LIBRARY)