No answers-more mistery, more desire for investigation. But actually, I can't choose for myself which version I wanted it to be... If it's human hand layed on it, then we still got brains which can create some amazing technologies, on one side... On the other, if it's aliens, then we have to figure out how their technology works, and then I guess we still didn't figured. But Aliens! Only one thought of their existence! It's amazing