It depicts a chariot race involving Greek mythological figure Pelops, who is racing to win the hand of love interest Princess Hippodamia.
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It’s the Roman version of dogs playing poker, so they are going to cover it back up.
Imagine in 4019 AD an archeological expedition of the ancient American civilization finding a mural of Dogs Playing Poker, which immediately becomes a Work of Art To Be Studied In Ancient Art Courses simply because, well, it's an ancient work of art...