A wall clock does double duty as a time-keeping aide and a decorative object with timeless appeal. If you have chosen a large decorative statement wall clock such as a vintage-style train station clock, use it to create a focal point in the room by hanging it over the couch, a mantle, or on the largest blank wall. A smaller wall clock might be hung on a side wall, in the empty wall space between tall windows, or anywhere else you would hang a photograph, painting, or piece of wall decor.