These works are large-scale cyanotypes. They are life-sized images of the body, created by using the body as a photographic negative, exposing directly onto the paper. Cyanotypes are created by hand-coating a surface (in this case, paper) with a light-sensitive solution, then exposing the coated surface to the sun. An object resting on the coated surface blocks portions of the light, which creates an impression of the object. After the exposure, the image is washed with water, which makes it safe to be viewed in daylight conditions. This is an antique photographic process (circa 1840).