Throughout most of architectural history, the arch has been the chief means of overcoming the spanning limitations of single blocks of stone or lengths of timber. There were three types of arches in ancient architecture. One, which survives today in Mycenean cyclopean construction, consisted of only three rough blocks of stone, the central one somewhat larger than the gap between the other two and wedged between them. A second, of which monumental examples survive in Egypt from the 3'd millennium BC, consisted of only two long blocks inclined toward one another as an inverted V-shape. This form was probably constructed even earlier in timber. The third, of which surviving examples are very widespread, was what is commonly known as the false or corbeled arch.
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