triangular lattice, square lattice, point visibilitypic.twitter.com/0GFPtThNkV
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
relatedly: https://arxiv.org/abs/1402.2818 / Radial spacing distributions from planar points sets/ by Michael Baake, Friedrich Götze, Christian Huck, Tobias Jakobi and https://arxiv.org/abs/1803.06481 / The density of visible points in the Ammann-Beenker point set/ Gustav Hammarhjelm