In her series “On a Clear Day” from 1973, minimalist and abstract expressionist Agnes Martin altercates the impossibility of perfection. In 30 silkscreens she recalls the number of days in a month, and – like Darboven – tries to capture them in a variation of grids. “On a Clear Day” was the first artwork Agnes Martin created after a seven-year period (1967-1974) in which she ceased painting entirely. It is considered one of the great graphic works of the 20th century.