The way our brain is wired up, we only see what we believe is possible. We match patterns that already exist within ourselves through conditioning.
So, a wonderful story that I believe is true
is that when the Indians - the Native American Indians on the Caribbean Islands - saw Columbus's ships approaching, they couldn't see them at all. Because it was so unlike anything they had ever seen before, they couldn't see it.
When Columbus's armada landed in the Caribbean, none of the natives were able to see the ships, even though they existed on the horizon. The reason that they never saw the ships was because they had no knowledge in their brains, or no experience, that clipper ships existed.
So the shaman starts to notice that there's ripples out in the ocean, but he sees no ship, but he starts to wonder what's causing the effect. So every day he goes out and looks and looks and looks. And after a period of time, he's able to see the ships. And once he sees the ships, he tells everybody else that ships exist out there. Because everybody trusted and believed in him, they saw them also.
(c)
What The Bleep Do We Know?