Area of a pentagon in space with plain circumference , by max bill , 1977 , sculpture , Concretism style , Leaf, Still life photography
a gold and silver object on a black background
 an abstract art piece. The background is black. The art piece is made of paper. The paper is in the shape of a sailboat. The sailboat is gold and silver. The gold is on top of the silver. There are thin gold lines on the gold. The silver lines are on the bottom of the boat.