Window-shopping in Florence is like visiting an enormous contemporary art gallery, for many of today's greatest Italian artists are fashion designers, and most keep shops in Florence. Shops are generally open 9-1 and 3:30-7:30 and are closed Sunday and Monday morning most of the year. Summer (June-September) hours are usually 9-1 and 4-8, and some shops close Saturday afternoon instead of Monday morning. When looking for addresses of shops, you will 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 will ship purchases, but because of possible delays it's wise to take your purchases with you.