Douglas Darden laughter was the laughter of three young girls, who were, in essence, their clients: the fourteen year-old twins, Cass and Polly, and their nineteen-year-old friend, Helen. Cass and Polly are most likely feminized renderings of the celestial twins of Greek mythology, Castor and Pollux (better known as Gemini), and their sister, Helen of Troy. Many of his original sketches and drawings for Oxygen House are now owned by the Museum of Modern Art, along with a select few of "Sex Shop" drawings; gifts of Darden's widow. The remainder of his drawings are held at the Avery Architectural and Fine Arts
The Rape of the Daughters of Leucippus In the painting, Phoebe and Hilaeira do not have distinguishing attributes. From the literature on Greek myths, however, we learn that Phoebe bore a son, Mnesleos, to Pollux, and Hilaeira bore a son, Anogon, to Castor. It would seem therefore, from the directions of the twins' fixed and admiring stares, that the daughter in the lower position, with her back to us, is Phoebe, and the daughter in the upper position, displaying a frontal view, is Hilaeira. The painting was bought in Antwerp in 1716 by Johann Wilhelm, Elector Palatine. Initially sent to Mannheim, by 1805/06 it had reached Munich.