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Originally Posted by Private Dick
It is physically impossible to ignore something that is visible, unless one is blind.
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That's not really true, at least not as you have stated it. Our brains have an editing function where you basically don't "see" certain things (register the perception subjectively) unless you make a conscious effort to look at them. The classic example is your nose and eyebrows--those are constantly in your visual field, but unless you are thinking about them you won't "see" them. That's also why people who wear glasses are not constantly distracted by them--you quickly just stop "seeing" them unless you try.
Our brains pull the same trick on all sorts of other things it considers commonplace and unhelpful for us to see, and it gets particularly active in editing stuff out when you are strongly focused on something (hence "tunnel vision"). In cases like this, if you are looking for the logos, you will undoubtedly "see" them. But if you just relax and focus on other stuff, you may not really "see" them any more, as your brain helpfully edits them out (as I said, I find this easy to do personally).
Of course this is for most people--some people's brains don't do this enough, or for that matter they can do it too much. Such people can have a host of related problems, up to and including serious mental illnesses (normal use of this editing function is really quite important in the world as we have structured it).
This ability is also subject to training and conscious manipulation. For example, people who need good "situational awareness" can train themselves to do less editing even when focused on a particular task (think a fighter pilot chasing an opponent who still needs to keep track of other possible opponents). Other people may find it helpful to be able to consciously trigger "tunnel vision" in order to ignore distractions (think a basketball player trying to hit free throws on the road).
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That fact is the very foundation of something called "advertising".
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Actually, advertisers have long been aware it is often all too easy for people to ignore their advertisements, which makes for unhappy clients. That is why they have developed a range of tricks to try to combat these functions. For example, flashing lights are a way of trying to get your brain to turn off its editing function. There are also relevant connections between auditory and visual processing, so that is why they may try ringing bells and such (think walking through a casino).
Given this ongoing battle between our brains and advertisers, a smart public policy option could be to allow building owners some sorts of logos and such, but don't let them use too many of these tricks to force people to pay attention.