Relief mit Spiegelquadraten , by heinz mack , 1966 , abstract , Op Art style
A black and white photo of a glass sculpture.
 a black and white photograph of a rectangular object. The object appears to be made of glass or crystal. It has a rectangular base and a rectangular top. Inside the object are rows of small, clear, rectangular objects that appear to be diamonds. The diamonds are arranged in a grid-like pattern. There is a light shining through the holes in the object.