WYM? I spoke on it previously:
I think future versions of us are the aliens who created those little gray shells to download their consciousness into in order to interact with this realm. I don't think they are what was responsible for the 10,000 year old culture boom. That I'd place on the folks who lived on Atlantis (or whatever the advanced preexisting culture was) that got wet up, bounced to new spots, poured as much of their info into the natives heads and set it off with the tools of civilization.
Its why so many regions just popped up, fully formed, at the same instance and then declined afterwards once they lost the original guiding light because the current level we're playing of the Game has a different resonance. I also suspect it will happen again and then in the next reboot they'll have their own variables and one day someone may think:
"Say, could there been a Coli breh from back when that was kicking metaphysics on his equivalent of our holophone about previous civilizations that were advanced as well?" and someone replies:
"Pfft, we're the best. The pinnacle. There has never been anything greater than us. What you're saying is impossible" as he sits entirely ignorant of the mountain of spare tyres, ipads and carrier bags that sit at the bottom of the ocean since the last rearrangement as the stage was set for the level they're playing.
Obviously only those who click the "boss fight" of this level (hint: Its you. More accurately your false self aka egoic thinking bka the illusion of wisdom) and win can graduate to respawn on the next stage which will be totally different, yet on the same planet.
Thats the Game. The one everyone is playing but only a few realize and it all spins once you insert your Soul as a credit into the flesh you're wearing that interacts with this realm to co-create the dimension. Thats an immense power, when you think about it.