There is an old tradition, which I am just now making up, that says when you find a fairy’s unbroken teacup on a cobblestone street, good luck will follow you around — as long as the cup remains intact.
For you see, anything that survives unbroken on a cobblestone street must be very, very lucky, indeed.
The fairies live in the oldest trees of San Miguel de Allende. When the trees are cut down to make way for more buildings, the fairies must flee and take with them the good luck, kind feelings, and benevolent outlook which they share with the city.
And the few possessions they can salvage ahead of the developers.