An arches or domes with a strong inner surface of concrete cemented into solid form rests as one unit, pushing its weight inward rather than upward.
An arches or domes with a tough layer of material cemented solid form rests as one unit, pushing its pressure downwards but instead of outwards. This enables marvels like the very first Pont du Gard and the Pantheon's 2nd-century cupola.
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