"The towers were so tall that for someone on the observation deck, the horizon was forty-five miles away. This distance was far enough along Earth’s curved surface for the Sun to set two minutes later for the person on the observation deck than it did for someone on the ground floor. If you could have run up the stairs at one flight per second, you would literally have stopped the sunset. Alas, you’d eventually have run out of breath or run out of floors. In either case, at that moment you’d lose the Sun for the night, as it set gently below your horizon."