Archive · 18 Sep 2026
New Study Challenges Parthenon’s Ancient Optical Illusion Myth
People have long said the Parthenon was built with special curves to make it look straight.
They thought the temple would otherwise seem to sag in the middle.
A mathematician named Alain Goriely studied this idea again.
He says the evidence does not support the story very well.
Some of the supposed visual effects may have been too tiny for builders to plan around.
The story appears to come from Vitruvius, a Roman writer who lived centuries after the temple was built.
Later scholars may have mistaken his secondhand account for direct knowledge.
This means the Parthenon can still be impressive without needing this particular optical trick.
Oxford University mathematician Alain Goriely argues that the Parthenon’s supposed optical corrections are largely a myth.
The temple’s curved base and bulging columns have traditionally been said to prevent it from appearing to sag.
Goriely’s paper finds little evidence that these visual effects required deliberate engineering.
The explanation traces back to the Roman writer Vitruvius, whose account was later treated as eyewitness evidence.
Ancient Greek thinkers still disagreed over whether vision involved rays entering or leaving the eye.
- Who
- Oxford University mathematician Alain Goriely, along with the ancient architects traditionally associated with the Parthenon and the writer Vitruvius.
- What
- A new paper challenges the claim that the Parthenon’s curves and bulging columns were engineered to correct optical illusions.
- When
- The Parthenon was built about two-and-a-half millennia ago; Goriely’s new paper revisits the longstanding explanation.
- Where
- At the Parthenon in Greece, with the historical explanation later recorded by Vitruvius.
- Why
- The study found that the alleged optical effects lack supporting evidence or were too small to clearly require deliberate engineering.
- Subject
- The Parthenon’s alleged optical refinements
- Researcher
- Alain Goriely, a mathematician at Oxford University
- Traditional claim
- A curved base and gently bulging columns prevented the temple from appearing to sag
- Study’s conclusion
- The optical-correction explanation is largely unsupported or concerns effects too microscopic to have been engineered
- Origin of the story
- Vitruvius, a Roman writer who lived four centuries after the Parthenon’s architects
- Ancient debate
- Greek thinkers disagreed over whether sight involved rays entering or leaving the eye