a nice example of design redundancy - and accessibility
Also of yellow dots.
From Redundant Coding - Individual Sensitivity Differences 
(photo credited by FAA to Armor Tile)
Which is part of a training module on the FAA’s Human Factors Research and Engineering Group
website. I’ll cop to it: I didn’t know the FAA had this sort of resource. But this section, at least, is well-written and well-illustrated.
If you’re interested in human factors engineering - and we all are, aren’t we, even if we don’t know it or won’t admit - it the FAA Human Factors Workbench
is pretty cool. And the more use it gets - the efficiently our tax dollars are used.

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