Also known as the “Golden Section”, it has been used in architecture since antiquity. It is a mathematical relationship that creates a series of numbers, which are used to create proportions between elements of a building. A few examples of its use include the Pyramids, Parthenon, the Taj Mahal and the Eiffel Tower. The ratio is 5:8 and a rectangle with those proportions (the white one in the illustration) have long been considered to have a pleasing balance. Architects today still use it frequently because it makes buildings aesthetically pleasing.

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