I exit the door, press the elevator button to go down, and wait for the start signal. Beep. The door opens, and the race begins. As I walk in, I hit ‘Ground Floor’ and wait impatiently for the door to close. I walk out and head toward Tower Bridge. As I ascend the spiral staircase of Tower Bridge, I wonder whether I should keep to the right or the left. The right is faster, as the staircase spirals that way, but the left is the customary path in the UK. I glance in the small mirror in the corner; there are no oncoming pedestrians. Right it is. Of course, I skip every other step to move as quickly as I can.