yes, that is how you percieve images, but how you process them is an entirely different matter.
what ids bright to you, is not necessesarily bright to me; your reality/mountain top is a total different one to everyone elses.
i know this because that is what my mum does for a living, she practices in nlp (neuro linguistic programming), teaches it to people, and also does group work on team building... etc and is the second largest company in the uk, and also travels the world doing this; so i think i have some grounds to support my claims
hence why science stays away from the brain, because everyone percieves, deal with, and recollects data/information in different ways. there are very few, even braod outlines for how it works at doing these things; since to every man/woman/child/antelope it is individual... there is no one true way to get inside someones head and understand it, since to do that you would need a deeper understanding of your own brain in order to relate to it.
such generalisations of being able to 'blend' into an environment are absurd in theory.
though, maybe someone needs to try dressing as a bunker in this instance and we'll see how well they fare