painter mel ramos caused a stir with his pop art portraits. >> evangelicals think my work, probably, is blasphemous. >> narrator: sculptor fletcher benton was a pioneer of kinetic art in america. >> i didn't even know what kinetic art was. >> narrator: and now in his 70s, avant garde composer terry riley continues to break new ground with the kronos quartet. next on "spark." >> narrator: major support for "spark" is provided by -- the james irvine foundation, expanding opportunity for the people of california, the william and gretchen kimball fund, diane b. wilsey,