This page is licensed under the [Creative Commons Attribution-ShareAlike 3.0 Unported license](https://creativecommons.org/licenses/by-sa/3.0/) (please attribute as "Dylan Grose CC-BY-SA-3.0, original at: http://www.generalisations.com/earthetch/" or similar) and uses the following works by other authors: 1.jpg * original at: https://commons.wikimedia.org/wiki/File:Aerial_View_of_the_Crop_Circle_in_Diessenhofen_15.07.2008_16-44-35.JPG * author: [Hansueli Krapf](https://commons.wikimedia.org/wiki/User:Simisa) * license: Creative Commons Attribution-ShareAlike 3.0 2.jpg * original at: https://www.nytimes.com/library/arts/121299heizer-art.3.html * author: Tom Vinetz * license: copyrighted (fair use claim) 3.jpg * original at: * https://picasaweb.google.com/lh/photo/CLTaXkSHtkYuLJDLK5J9ywRkAxLSQqAlaCvQhQKIgrg?full-exif=true * https://commons.wikimedia.org/wiki/File:Fazenda_Colorada.jpg * author: Sanna Saunaluoma * license: Creative Commons Attribution-ShareAlike 3.0 4.jpg * original at: https://commons.wikimedia.org/wiki/File:Lignes_de_Nazca_D%C3%A9cembre_2006_-_Colibri_2.jpg * author: [Martin St-Amant](https://commons.wikimedia.org/wiki/User:S23678) * license: Martin St-Amant - Wikipedia - CC-BY-SA-3.0 (Creative Commons Attribution-ShareAlike 3.0) 5.jpg * original at: https://commons.wikimedia.org/wiki/File:Nazca-lineas-arana-c01.jpg * author: https://commons.wikimedia.org/wiki/User:Colegota * license: Creative Commons Attribution-ShareAlike 2.5 Spain 6.jpg * original at: https://commons.wikimedia.org/wiki/File:Spiral-jetty-from-rozel-point.png * author: Robert Smithson, sculpture; [Soren.harward](https://en.wikipedia.org/wiki/User:Soren.harward), image * license: public domain, sculpture; Creative Commons Attribution ShareAlike 2.0, image 7.jpg * original at: * http://www.livescience.com/16045-aerial-photos-mysterious-stone-structures.html * http://i.livescience.com/images/i/000/019/959/original/Wheels--1.jpg * author: David L. Kennedy APAAME_20080925_DLK-0308 * license: copyrighted (fair use claim) 8.jpg * original at: https://commons.wikimedia.org/wiki/File:Marree_man.jpg * author: https://en.wikipedia.org/wiki/User:Diceman * license: public domain (by author) 10.jpg * original at: https://secure.flickr.com/photos/79955806@N00/175490491/ * author: David Price * license: Creative Commons Attribution-NonCommercial-NoDerivs 2.0 Generic 11.jpg * original at: https://commons.wikimedia.org/wiki/File:Nazca_monkey.jpg * author: Maria Reiche * license: public domain (by author)