Great article but I found this one easier to understand including quotes from the artist about how it works, https://www.quora.com/At-the-Hoover-Dam-what-is-the

Great article but I found this one easier to understand including quotes from the artist about how it works, https://www.quora.com/At-the-Hoover-Dam-what-is-the-meaning-of-this-memorial-inlay-with-the-word-Alcyone https://www.quora.com/At-the-Hoover-Dam-what-is-the-meaning-... For some reason the author doesn't even mention https://en.wikipedia.org/wiki/Alcyone_(star) https://en.wikipedia.org/wiki/Alcyone_(star) which is written into the map. What better place to preserve a star map than an indestructible cement dam in the desert.