It means circus acrobats who do acrobatic feats when lying on a special bed, trink. Antipode's job is often a job of juggler or reverse equilibrist, where legs, that are stronger than arms, show the same dexterity in feats specific to arms. Most often a ball as well as small cask and rug are used in such acts. And these things are used by the performer to juggle with them at various rates and in different sequence. Icarian Games are an isolated kind of this genre.