:Image:Notre Dame of Paris' regulator lines.jpg

Regulating lines that give the Cathedral of Laon golden section.

LUND, Frederik Macody. Ad Quadratum. 1919.

Sourcing to prove the Laon's Cathedral has golden ratio in its design.

The image comes originally from a book by Frederik Macody Lumd, 1919, so is PD in the US.

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