I found this on the corner of Bergen&Smith:
It's a pretty ordinary fire escape (although the "Z" kind is much more common). It led me to think about the ratio between the V shape and the outer corner, like in this diagram:
So, what is the ratio between the gray and the white?
Just from looking at it I want to say each part is 1/3 of the total area. However, there probably is another number, something much more precise.
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