Julian Stanczak
(1928 - 2017 )

Julian Stanczak was a Polish-born American painter and printmaker who is considered a central figure of the Op art movement in the U.S. during the 1960s and 1970s. Described as an artist whose work "evinced a tremendous geometric inventiveness", Stanczak is primarily known for his large-scale polychromatic abstract compositions made using acrylic paint on canvas in which he explored the perceptual dimensions of color.

https://en.wikipedia.org/wiki/Julian_Stanczak

And Then There Were Three
1971
acrylic on canvas
121.9 x 365.8cm
Toledo Museum of Art, Toledo, Ohio, USA
https://emuseum.toledomuseum.org/objects/58734/and-then-there-were-three