the elamite tomb (dated 1500 BC) contains a parabolic vault which is considered one of the earliest evidences of arches in Iran.
how did they get it?
a true arch is composed of wedge-shaped blocks (typically of a durable stone), called voussoirs, with a key stone in the center holding them into place. the weight is transferred from one voussoir down to the next, from the top of the arch to ground level, creating a sturdy building tool.
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