or is there more possibilities of something different than life that is out there?

I've heard the theory that without humanity our world would not exists as that world that we know. For example - we see the colors because the light reflecting from some objects and perceived by our eyes. But cat eyes differently perceive that reflected light and they see the the world in other colors. So - where is the truth? I mean universe that we know exists only in our brains, and nobody knows how it will be looks like without us.