The Mysterious Pyramid Coincidence

Bosnian Hill an Ancient Pyramid, AP
[Note: Joke, hopefully, ensues]
So, we have yet another example of the mysteriously universal practice of pyramid building, which took hold at a certain time in every ancient human civilization, in every corner of the world.
Maybe it’s just a coincidence. There was certainly no possible route of human-to-human communication that could have accounted for the spread this practice around the world at that time.
And maybe this is also a coincidence: In every single instance, the pointy part of the pyramid was facing upward, the very direction from which any extraterrestrial guidance of these isolated early cultures would have had to come.
A coincidence? I’m sure.