Apparently, the shape of a peeled orange (a flattened sphere) is unrelated to a violin's f-holes. I had it in my mind that the S-shapes were similar for acoustic reasons.

Looking it up just now, it turns out that, "Modern physics research shows that the f-shape allows the instrument to push much more air than a traditional round hole, resulting in greater acoustic power and projection."

Just wanted to share in case someone else had that same bit of false knowledge in their head.