File:Laon Cathedral's regulator lines.jpg

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DescriptionLaon Cathedral's regulator lines.jpg	English: Regulating lines that give the Cathedral of Laon golden section.
Date	1919
Source	LUND, Frederik Macody. Ad Quadratum. 1919. Sourcing to prove the Laon's Cathedral has golden ratio in its design.
Author	Frederik Macody Lund
Permission (Reusing this file)	The image comes originally from a book by Frederik Macody Lund, 1919, so is PD in the US.

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
	This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

File:Laon Cathedral's regulator lines.jpg

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