Fifteen Variations on a Single Theme, v. 14 , by max bill , 1938 , abstract , Concretism style , Line
An image of a pentagon with lines going through it.
 an image of an octagon. The octagon is colored red, blue, pink, and purple. There is a green triangle in the middle of the octagon that has lines going through it. The lines are black. The background of the image is white.