1998 ALEXANDER CALDER #3202a Plate Block of 10 x 32 cents US Postage Stamps

On March 25, 1998 in Washington DC., the USPS honored Alexander Calder, considered one of the most well-known artists of the twentieth century. Primarily a sculptor, Calder created several different abstract works of art. He is most famous for his sculptures known as mobiles. Mobiles are balanced arrangements that move using wind currents. One such work, "Black Cascade, 13 Verticals," is pictured on one of these stamps.