I think the round shape of the clock plays a key role. It leads my eye around and around, rather than out. And the hands on the clock are also an important visual cue. The long hand points down and back into the middle of the photo, where I am then engaged by the busy lights, and the mirror and the waitress. The stainless steel vent and coffee urns lend visual weight to the photo and balance the clock. Their placement also encourages the viewer's eye to stay inside the frame, where there is still more to see.
And by the way, it's always Christmas at Mi Tierra!