Consider this picture: You are on the ground floor of a building, one of those modern palaces where balconied floors surround a central atrium reaching all the way to the roof. As you gaze upward, you can see fifteen floors of the building, all containing the expected level of activity: people are walking, alone and in groups, glass elevators are gliding up and down, a few people lean on the balcony railings, admiring the beauty of the architecture.