The Lincoln Cent is the current one cent coin of the United States. It was adopted in 1909, replacing the Indian Head Cent. Its obverse, featuring a bust of Abraham Lincoln (to commemorate his centennial), has been in continuous usage. Its reverse was changed in 1959 from a wheat stalks design to a design which includes the Lincoln Memorial (to commemorate Lincoln's sesquicentennial) and was replaced again in 2009 with four new designs to commemorate Lincoln's bicentennial. There are more one-cent coins produced than any other denomination, which makes the Lincoln Cent a familiar item. The obverse is the longest design used for any circulating American design.