Spoiler alert: the final image of John Fulljames’s production of Monteverdi’s The Return of Ulysses at the Roundhouse is haunting. Ulysses (Roderick Williams) and Penelope (Christine Rice) stand facing each other at last, arms outstretched. But Penelope is on terra firma. Ulysses stands on the revolving walkway that has served as the stage throughout most of the evening.