Curtain Knob

Black and white photo. Two objects. The object on the left has a long screw with a rounded knob on the end. The screw is attached to a flower shaped object. The flower has a round center with petal shapes around it. The object on the right resembles a flower with petal shapes around a center circle. There are two rounded teardrop shapes on the right. There is a ruler on the bottom left and a label on the bottom right reading "THE METROPOLITAN MUSEUM OF ART". The object on the left appears to be a curtain knob by artist not specified.