There is an article on Space.com titled: Reconstructing Ets: “Lessons from a Neanderthal.” By Douglas A. Vakoch. - The article suggest that “SETI scientists, and Astrobiologists share a common challenge,” and are limited by the data to possibly find evidence of advanced civilizations outside of our solar system.
The great silence, and Fermi Paradox is similar as asking why there is no evidence of cave art for the Neanderthal. If Neanderthal had the ability to hunt, and form communities, with a proto language, why were they not able to visualize enough to put a picture on the cave walls?
One reason maybe that Neanderthal’s did not have the ability to visualize their memories, similar to how animals don’t remember their dreams. – Neanderthal’s inability to visualize is similar to our ability to detect ETI’s. – It was not until a world wide event took place about 30 thousand years ago, that the first evidence of cave art was discovered. Neanderthal, like man did not have the ability to do cave, since Neanderthal died off about 40 thousand years ago. – That is why the north American Indians labeled America as the land of dreams, because they migrated 30 thousand years ago, they could start remembering their dreams, and do drawings on stone, and rocks.
According the Fermi Paradox’s the universe should have many advanced ETI’s that should exist, yet, no observational evidence to support Fermi’s theory. – The lack of remembering a visual image is similar to not being able to discover evidence of ETI’s.
There appears to be something wrong with our thinking, or we are unable to cross over to the ETI’s worlds.