breathe deep

I read something once by Deepak Chopra about how there's no direct input mechanism from the outside world to the human mind. As far as I could comprehend the explanation from a non-medical perspective, we interact with the world using our senses, which are then interpreted by our brains. Much of the activity that occurs is unconscious and automatic in our brains, and the sundry mechanisms then form some sort of a picture of the outside world in our minds based on the input that was taken in via the senses. Chopra, (who is a doctor), of course explained it much better than I, but his main point was that our sensations all go through our brain's filter before we can experience them consciously.

Chopra's conclusion was that your world is inside of you. The world that you see and experience is inside of you, so you are, in a way, creating your world.
Take that fascinating souffle of weirdness, then add the fact that certain other animals have different senses from us, and you get an awesomely perplexing situation that always makes me look at that sunset a little differently. ;)