Stand for a moment in piazza del Duomo and watch what happens.
Most visitors are looking up, but only for a second. A photo, another photo, a quick glance at the screen to check the result.
Then they move on. The next museum, the next street, the next famous view. Residents behave differently. They don’t stop at all. They cross the square quickly, eyes forward, moving through the crowd with the quiet efficiency of someone who has done it hundreds of times. For them, piazza del Duomo is not a destination. It is an obstacle.