Inauguration Day has us thinking about flags; this photo by Paul Costello hits the mark.

Above: Bulldog 100 Percent Cotton Outdoor American Flag; available in a range of sizes, from 2 by 3 feet ($24.95) to 8 by 12 feet ($179.95) at Flag Stuff.

Above: 48 Embroidered Star Flag; c. 1945-50 at Jeff R. Bridgman, a prominent dealer of antique flags.

Above: Jasper Johns Flag, 1954; 38 by 30 inch MoMA exhibit poster, $21.99 at AllPosters.com.