Walking the calli
The calli are narrow, and they are the streets of people who live and work here.
Keep right
Like on a road: walk on the right and let people in a hurry get past.
Checking the map? Step aside
Don't stop in the middle of a calle or at a crossing: move to the side, close to the wall.
Single file, not side by side
In narrow passages walk in single file: people coming the other way need to get through.