But then a sculpture such as that of Pan making love to a goat plunges us back into darkness and uncertainty, and makes the chasm of two millennia feel as abyss-like as ever. We will never be able fully to comprehend what the sculpture meant to the Romans who first saw it. Where we see smut or rape, perhaps they saw comedy or even tenderness. All we can say with certainty is that their attitudes towards sex and violence differed radically from ours. Understanding the past is an elusive, ever-changing quest.
from the review by Alastair Sooke on the BBC site.