Final answer:
Circus acts encompass a wide array of performances, ranging from chariot races to gladiatorial combat from ancient Roman times to modern artistic displays. Signifying both grandeur and cultural expression, historic references and art like Rouault's work display the rich emotional tapestry of the circus.
Step-by-step explanation:
The circus act in question seems to involve a variety of performances, which could include feats typical of ancient circuses, such as chariot racing, gladiatorial combat and the exhibition of exotic animals, as well as more modern acts like comedy, musical performances, and other artistic displays.
The references to classical Roman circus activities and to performances that resonate with the culture of the Roman Empire, such as charioteers who were senators and the Circus being consecrated to the Sun, suggest a historical context.
Furthermore, the mention of the Circus Maximus and exhibitions that involved members of the senatorial order, embody the grandeur and the cultural importance of the circus arts in Roman society. Meanwhile, the inclusion of artistic acts like dancing under the circus sands and the depiction of a circus girl in an art piece by Rouault signifies the emotional and cultural expression within circus performances, which transcends time.