@henryseg: Lenstra's Droste procedure (some modified version) with this: https://media.giphy.com/media/I4Py2JL5ZCOVG/giphy.gif …
this image by Escher: http://lcart1.narod.ru/image/fantasy/mc_escher/escher_spirals.jpg …
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
this image by Escher: http://lcart1.narod.ru/image/fantasy/mc_escher/escher_spirals.jpg …