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How did light enter the interior of the Parthenon?

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The Parthenon temple in Athens, Greece, is illuminated at night, showing its iconic Doric columns and partially ruined structure atop the Acropolis. — Parthenon Night view of the Parthenon, Athens.

The interior of the Parthenon was primarily illuminated by light entering through the east doorway. Additionally, some light may have filtered into the interior through marble tiles located in the roof and ceiling.1