Nini and Desmond's mother, Leslie, is teaching the twins about ancient history, and as a result they've been very keen on, in turn, dinosaurs, Egyptian gods and now Greek mythology. Desmond wants to be Hermes and Nini wants to be Demeter. (They're particularly fond of the story of Demeter, Persephone and Hades, which coincidentally is the story I used to illustrate Owen Barfield's conception of myth -- a powerful influence on Lewis and Tolkien -- in The Magician's Book.)
Recently, they made a pilgrimage to the Metropolitan Museum in Manhattan to search the Met's collection of classical art for depictions of "their" deities. Their friend Benny, a partisan of Zeus's, came along, and everyone was costumed as their favorite god. Here are some photos.