“Playing hide-and-seek in a nocturnal labyrinth of levels, waterfalls, balustrades, caves, and gushing, incessant fountains, until the water witch and the fountain become one.” To the notes of Antonio Vivaldi’s Four Seasons, a baroque lady enters and exits the Tivoli Fountain in Rome, until she merges with the water. The title itself, Eaux d’artifice, is a French play on words ...