Composition Derived from the Equation y = -ax2 + bx + 18 with Green, Orange, Violet (Black) , by georges vantongerloo , 1930 , abstract , Neoplasticism style , Line, Rectangle, Material property
An abstract painting with white, green, purple, and yellow squares.
 an abstract painting. The painting is composed of squares. The first square is green. The second square is white. The third square is yellow. The fourth square is purple. The fifth square is black. The last square is gray.