Sigiriya Boulder Garden acoustic properties: Audience Hall Boulder whisper amplification?
What architectural overhang geometry and gneiss bedrock resonance allow whispers to travel across the ancient Audience Hall Boulder at Sigiriya?
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4 Answers from travellers
The Audience Hall Boulder in the southern boulder garden of Sigiriya features a massive natural gneiss rock shelter with a smoothly chiseled stone bench running along its base. 5th-century architects utilized the natural acoustic properties of the concave granite overhang to create an amplified sound chamber: speech or whispers uttered near the rear stone throne bounce off dense crystalline rock surfaces without acoustic absorption, projecting clearly across the exterior royal courtyard while muffling ambient wind noise.
The stone bench is carved directly from the living bedrock floor, flanked by socket holes that once anchored timber canopy pillars.
King Kasyapa’s ministers and royal advisors convened council meetings in this sheltered enclosure shielded from tropical sun and rain.
Tourists testing the acoustic resonance must speak in soft tones so nearby groups can experience the natural amplification.
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