Nanno de Groot (March 23, 1913 – December 26, 1963) was a self-taught artist. He belonged to the group of New York School Abstract expressionist artists of the 1950s. He wrote: In moments of clarity of thought I can sustain the idea that everything on earth is nature, including that which springs forth from a man's mind, and hand. A Franz Kline is nature as much as a zinnia.