If you’ve ever tried to buy Christmas tree lights the week of Christmas, you know it’s a fool’s errand. The store shelves are bare of white lights. The clerks think you have beanbags for a brain when you ask where they are. “A little late in the game, aren’t you?” they say before pointing out a strand of cough-syrupy red lights long enough to wrap the Empire State Building. Or a box of twinkling snowflakes that look more like sickly amoeba.