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
Castor et Pollux In 1737, he was testing the limits of tragedie lyrique; where in 1754, he had done more work with ballet-oriented genres in which he included striking musical compositions that delighted audiences. Thus, Dill proposes that there may have been some commercial concerns behind the change in aesthetic in 1754, as the revised version conformed more to the traditional Lullian aesthetic. He comments that while many see the revision as more innovative, in actuality the 1737 version was the more daring. "Castor et Pollux" appeared in 1737 while the controversy ignited by Rameau's first opera "Hippolyte et Aricie" was still raging.