Better yet, think of an outfield fence as an outfield fence. If it goes over in fair territory it's a home run, if it don't it's not. The yellow stuff on top is just contrast, on fences that green that are above grass that is green, and often times in front of a backdrop that is green, to help umpires know whether a ball went in front of or behind the yellow stuff. It also protects players from injury when they up for a ball, but it could be any color to to do that.
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