Window-shopping in Florence is like visiting an enormous contemporary-art gallery. Many of today's greatest Italian artists are fashion designers, and most keep shops in Florence. Discerning shoppers may find bargains in the street markets. Shops are generally open 9 to 1 and 3:30 to 7:30 and are closed Sunday and Monday morning most of the year. Summer (June to September) hours are usually 9 to 1 and 4 to 8, and some shops close Saturday afternoon instead of Monday morning. When looking for addresses, you'll see two color-coded numbering systems on each street. The red numbers are commercial addresses and are indicated, for example, as 31/r. The blue or black numbers are residential addresses. Most shops take major credit cards and ship purchases, but because of possible delays it's wise to take your purchases with you.