I believe that everybody has the capacity to be creative, and those who think they don't are impeded not by a lack of creative spark, but rather by their own inhibitions and belief that they aren't creative. Part of this is cultural; engineers are told by society that an engineer/artist schism exists and incorporate that meme into their self-image, writing off their own ability to be creative. This becomes a self-ful…
Maybe, but I am almost certain that this capacity is highly unequal. Some people are like walking geysers of inspiration and you cannot suppress them culturally anymore than you can prevent the July sun from baking the sand. Others are decidedly low-voltage even when it comes to private creativity (such as decorating your own home).
It is the same with muscles. We all have some muscles, but only some people do really have the potential to be good athletes.