There they were: 38 people seated in twos with a driver and portly guide at the front; the latter commentating into a microphone as her audience looked on.
Disengaged, half asleep, blindly staring out of the window; their tired eyes seemed to rest upon nothing and no one as the commuters around them moved with the purpose of the rush hour, while the historic landmarks of the city stood still where they have done for hundreds of years.
Unspeaking - save for two at the back pointing at a map - each person had the passive posture of someone who had nothing to do that day but listen and wait for the next thing to appear.
We sat there on our separate sides of the road, a bus of locals on one side, a coach of tourists on the other, and I looked at the passengers one by one and thought:
God, you look so bored.
I watched them, momentarily distracted from the dull feeling in my chest, the half-conceived thoughts and feelings in my head, the ideas that would never even see paper, let alone fruition, and the minutiae of life that confines itself to one solitary hour at the beginning of the day and another at the end.
And I wondered, as the bus pulled away and I prepared to join the flow of people on the pavement, if any of them had looked at me and thought exactly the same thing.