The Parthenon has no straight lines because it was designed to correct human optical illusions
Architects designed the Parthenon with subtle curves and leaning columns to counteract human optical illusions, ensuring the temple appeared perfectly straight and balanced to the naked eye.
The Parthenon, completed in 447 BC, contains virtually no straight lines despite its rigid appearance. To correct for 'entasis'—the optical illusion that makes perfectly straight columns look thin or concave—the architects curved each of the 11-meter columns outward by 6 centimeters. Additionally, the corner columns lean inward by 4 centimeters to ensure they appear vertical against the bright sky, which would otherwise make them seem to tilt outward.
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