High Quality Content by WIKIPEDIA articles! The 9th Street Art Exhibition, otherwise known as the 9th St. Show, Ninth Street Show May 21-June 10 1951 was a historical, ground-breaking exhibition curated by Leo Castelli. It represented the New Art in the 20th Century. It was a gathering of a number of notable artists, and it was the stepping-out of the post war New York avant-garde, collectively known as the New York School. The opening of the show was a great success. According to Altshuler, "It appeared as though a line had been crossed, a step into a larger art world whose future was bright with possibility."