Enormous oil on canvas by Color Field painter Stephen Mueller, c. 1970. This piece is a stunning work that implements a number of stimuli working in tandem to manipulate the viewers depth perception. Mueller was exposed to many of the pure abstract painters of the 1950s and 60s and was also highly influenced by the colorful pop art of Warhol when he was employed at Andy's infamous 'factory'. https://www.1stdibs.com/furniture/wall-decorations/paintings/stephen-mueller-painting/id-f_741698/