Black Diamond , by ilya bolotowsky , 1978 , Pattern, Line
A picture of a cross with red, blue, and black stripes.
A square with a white border has a design on it. The design is composed of black, red, blue, and white lines. The lines are arranged in a cross shape. The blue lines are on the left side of the cross and the red lines are in the middle. The white lines are crossed over each other. The borders of the design are white.