Voice amplification Circular Mound Altar
panorama of circular mound altar
there special result of architectural form of circular mound altar can explained through religious ceremonies performed there. boulders on top terrace amplify voice 1 whispers through it. when emperor stands in center of top terrace, on top of central stone , performs ceremony pray rain, voice become loud, heaven oracle. when coupled solemn ritual performed group of chinese monks, atmosphere given more mysterious effect sounds generated gradually increase in volume.
the cause of effect extreme smoothness of altar’s walls , floor, causing sound waves in directions spread stone balustrades , reflected back. scientists have calculated time taken process mere 0.07 seconds, showing process instantaneous. due process, echo created, resulting in volume of emperor’s voice being doubled. effect important symbolizes emperor’s voice reach heaven.
the altar has withstood test of time 500 years , still stands preserved without cracking or sagging. building still in condition because renovated during 1749. because of high durability of materials used build piece of architecture. walls layered marble , rest of altar consists of initial material used construction, blue-stone. marble important material use helps create echo used amplify sound due extremely smooth surface.
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