Leon Polk Smith gave geometric painting a homespun twist. Born in 1906 in what was then Indian Territory, this son of the Oklahoma plains gravitated to art after a 1936 encounter in New York City with the work of Piet Mondrian. In the current show, “Linear Curves—Works From the 1960s,” we revisit Smith when he was working at the peak of his powers, melding the colors and lines of minimalism with Native American pattern work and his memories of the American landscape. His paintings may be less well known than those of fellow geometric abstractionists Ellsworth Kelly and Al Held, but his influence was broad. At Louis Stern Fine Arts, 9002 Melrose Ave., West Hollywood, (310) 276-0147. Prices range from $3,000 to $16,000.