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Proportion is a central principle of architectural theory and an important connection between mathematics and art. It is the visual effect of the relationships of the various objects and spaces that make up a structure to one another and to the whole. These relationships are often governed by multiples of a standard unit of length known as a "module".
- P. H. Scholfield (1958). The Theory of Proportion in Architecture. Cambridge University Press.
- Hanno-Walter Kruft (1994). History of Architectural Theory. Princeton Architectural Press. ISBN 9781568980102.