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http://www.gamespot.com/forums/playstation-nation-1000002/ios-game-monument-valley-on-ps-vita-31225141/

https://au.pinterest.com/pertemu/monument-valley/

http://gazettereview.com/2016/03/top-five-games-like-monument-valley/

https://appadvice.com/appnn/2015/12/get-monument-valley-now-for-free-on-the-app-store

https://girlvsgui.com/ui-review-monument-valley/

http://www.monumentvalleygame.com

http://www.andrewlipson.com/escher/relativity.html

http://www.icklepix.com/mobile/?tag=escher

https://www.architectsjournal.co.uk/in-pictures-drmms-endless-stair-opens-to-the-public/8653111.article

https://architectureas.wordpress.com/2013/10/03/a-stair-drmms-endless-stairs-in-tate-modern/

http://www.tate.org.uk/context-comment/blogs/endless-stairs-and-5-other-cool-things-london-design-festival

http://distractify.com/old-school/2014/06/14/the-24-craziest-staircases-that-i-want-to-climb-right-now-1197735232

https://www.mimoa.eu/projects/Germany/Munich/Rewriting%20Stairs/