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Cracks and crevices became hidden patterns, and our walls, floors, ceilings and sidewalks are filled with designs worthy of an astrologer’s star map.

Next, they match the patterns of stars they see in the sky to the ones shown on the star map and make a record of it.

Several users suggested that the image was a star map broadcasting the civilization’s location.

The first person we know did this was Greek polymath Hipparchus, who created a star map noting the brightness of various stars more than two millennia ago.

You can find a good star map online pretty easily; any search engine will point you to one.