The dome's apex may be closed or may be open in the form of an oculus, which may itself be covered with a roof lantern and cupola.ĭomes have a long architectural lineage that extends back into prehistory. The precise definition of a dome has been a matter of controversy and there are a wide variety of forms and specialized terms to describe them.Ī dome can rest directly upon a rotunda wall, a drum, or a system of squinches or pendentives used to accommodate the transition in shape from a rectangular or square space to the round or polygonal base of the dome. There is significant overlap with the term cupola, which may also refer to a dome or a structure on top of a dome. A dome (from Latin domus) is an architectural element similar to the hollow upper half of a sphere.
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