Francis Hewitt, Generation of the Tesseract, ballpoint pen on Paper, 1961
The American artist collaborative, Anonima Group, was founded in Cleveland, Ohio in 1960 by Ernst Benkert, Francis Hewitt and Ed Mieczkowski. Propelled by their rejection of the cult of the individual ego and automatic style of the Abstract Expressionists, the artists worked collaboratively on grid-based, spatially fluctuating drawings and paintings that were precise investigations of the scientific phenomena and psychology of optical perception.
More info and images here: http://anonimagroup.org