Cool!  Perhaps someone could cast a piece like this with concrete or baked clay inside a larger, sturdy building to display an alphanumeric message to future generations, only during specific alignments.  I can see one potential benefit compared to hieroglyphs, tablets, pillars[0], and other megalithic messages that some of our ancestors left us; it would take different skills to warp its message than simply a chisel or spray paint.  One fictional story that comes to mind, Indiana Jones&#x27; Staff of Ra[1], makes this seem like even if only for a treasure hunt game, it would make for a fun story later on.<p>0: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Ashoka_Pillars" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Ashoka_Pillars</a><p>1: <a href="http:&#x2F;&#x2F;indianajones.wikia.com&#x2F;wiki&#x2F;Headpiece_to_the_Staff_of_Ra" rel="nofollow">http:&#x2F;&#x2F;indianajones.wikia.com&#x2F;wiki&#x2F;Headpiece_to_the_Staff_of...</a>