My favorite piece of artwork of all time was at the Whitney Museum of American Art in New York City. It's also my favorite museum, and this piece probably cinched it. I was walking through the exhibit halls, when I happened to bump into an older woman. I said "excuse me" without making eye contact, and I kept perusing the art. Then I noticed a bench in the middle of the room. It was too far to be a seat for pondering the wall hangings, but it was clearly meant for observation. So, I sat down. I watched the crowd. It took me a few minutes to notice that the old woman was still standing there, where I had bumped into her. She was slightly hunched, perhaps in her seventies. She carried a shopping bag, and was wrapped in average clothes for a cold New York day. But the most interesting thing about her was that she was not real.