Triptych No. 3A , by joe tilson , 1960 , abstract , Post-Painterly Abstraction style , Orange
A painting of a red, yellow, green and orange background.
 a painting of three panels. The first panel on the left is yellow. The middle panel is orange. The second panel is red. The third panel is green. There is a circle painted on the middle panel. The circle is light brown. The painting has a rough texture to it.