Solomon R. Guggenheim Museum, New York Gift, The Josef Albers Foundation, Inc., 1991 © 2016 The Josef and Anni Albers Foundation / Artists Rights Society (ARS), New York

Variant “Adobe: Gray Turns Violet” by Josef Albers, 1958

https://botfrens.com/collections/212/contents/137803

Solomon R. Guggenheim Museum, New York Gift, Mr. and Mrs. Alan H. Pollack, 1984 © Victor Vasarely

Lacerta by Victor Vasarely, 1955

https://botfrens.com/collections/212/contents/137325

clear blue sky streaked with five short contrails