Concreção 7961 , by luis sacilotto , 1979 , abstract , Op Art style , Circle, Line, Pattern, Symmetry
A blue and white checkered optical illusion is shown.
 an optical illusion. The illusion is made up of blue and white checkered squares. In the center of the image, there is a blue circle. Around the blue circle, there are black lines going through the center. The lines are going in a spiral direction. The background of this image is white.