This is a tribute by American sculptor J. Seward Johnson to the iconic image by Grant Wood.
American Gothic is a painting by Grant Wood from 1930. Portraying a pitchfork-holding farmer and a younger woman, in front of a house of Carpenter Gothic style, it is one of the most familiar images in 20th century American art and has achieved an iconic status in mainstream culture as one of the modern world's most recognizable images and most parodied artworks.

http://en.wikipedia.org/wiki/American_Gothic