Knot , by m c escher , 1966 , figurative , Op Art style
a black and white image of a metal object
 a black and white image. It looks like an abstract sculpture. The sculpture is made up of multiple interlocking circles. The outer circle is larger than the inner circle. The inner circle is smaller than the outer circle. Each circle has a unique design on it. The design is composed of interlocking lines that form a star shape.