In this stone you can supposedly see two gray aliens holding h ands. Or perhaps, giving a fist-bump.
The theory is that an advanced race of aliens could have come from the star Deneb (or around it) to our planet in remote times, and had contact with the primitive humans, and these immortalized the moment in this relief in stone.
Check Out The Alien Image Here:
Look at this image. It is quite clear that these are aliens holding hands or standing next to each other. One alien (the one on the right) appears to be pointing in a direction and attempting to lead the other alien in that way.