The article presents information on American artist Robert Irwin. It comments on changes to his artistic style over the years, including from 1958 to 1960 with eight-by-eight inch oil paintings with built wooden frames that complemented the paintings' colors, and his shift in 1962 to stick-like slashes that depended on the perceptual skills of viewers. It talks about his use of light and space in site-specific environments in the 1970s.