I've seriously just been comtemplating that concept!! I love it how we're ont he same page... Tibetan Buddhist's say your mind is just a crystal, and everything it percieves is perceived through filters that aren't necessarily true..
Something like that I just think the "unquestioned" beliefs we hold at the inner part of our mind/being color how we see things. Often we don't even know that we believe something. A good example: some psychologists say that if you were to ask an anorexic to look into a mirror and you could actually get an image of what they perceive in the mirror you would see someone overweight. Because their mind colors what they see.
That's true. I've had eating disorder issues and you never see what's true. When I was 14 I was anorexic, and when I was 16 I got to my lowest weight, but thought I was huge, didn't look any different to myself. Now that I've balanced out I realize how skinny I was and wish I had enjoyed it then, instead of seeing someone huge in the mirror.