They play tricks and dance to the accompaniment of the Baroque-era music of the Jesuit missions, then around midnight fireworks pop from the top of their wide-brimmed hats, symbolizing the gift of light and vision to live respectfully.
And, of course, there were the girls dressed in honour of St Lucia, who is the patron saint of light and vision and is thus much celebrated in a place where the winter sun barely rises above the horizon.