Duo H , by josef albers , 1966 , abstract , Constructivism, Op Art style , from the series Structural Constellation , Line, Pattern
A black and white image of two geometric shapes.
 a blackboard with white lines drawn on it. On the left side of the blackboard there are two identical images of a cube. The first image on the left is a cube that has six sides and six sides. The second image is on the right of the first image. Both images have six sides that are connected by a series of lines. The lines are drawn in a way that they form the shape of the cube.