UK mathematician debunks myth around Parthenon’s optical illusions — SkimNews
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- Prof Alain Goriely at the University of Oxford concluded after detailed mathematical modeling that the optical illusions the Parthenon's curves are meant to fix are "either nonsense or practically imperceptible," publishing in Royal Society Open Science.
- Goriely's study traces the myth to 1st-century Roman architect Vitruvius, who wrote about the Parthenon 400 years after its construction — a tale today's AI chatbots still repeat as fact.
- The Parthenon's stylobate rises 6cm in the center to form a gentle arc, but Goriely found no evidence that long horizontal lines naturally seem to sag, refuting Vitruvius's explanation.
- The Hering illusion, cited as the mechanism by which columns cause the sagging effect, is strongest at acute angles — but the Parthenon's columns are too vertical to produce it, and the effect is unproven in 3D.
- The columns' entasis bulges by a mere 18mm, barely perceptible at typical viewing distances, undermining the claim it corrects an illusion making columns look too narrow.
- Goriely proposes alternative explanations: the curved base may have prevented rainwater pooling, and curved columns may simply have felt more organic and pleasing to the ancient Greeks.
- Frank Salmon, professor of the history of classical architecture at Cambridge, said experts have long been cautious of treating Vitruvius as a "bible" to explain Greek architectural practices centuries before his time.
Why it matters: Goriely's analysis forces a reassessment of why the Parthenon's distinctive curves exist and exposes how an unverified text from a Roman writing 400 years after construction calcified into accepted architectural history — a cautionary case for both scholars and AI systems that now propagate the Vitruvian explanation as fact.
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