People like to call this “thinking outside of the box,” which is the wrong way to look at it. Just like Neo needed to understand that “there is no spoon” in the film The Matrix, you need to realize “there is no box” to step outside of.

You create your own imaginary boxes simply by living life and accepting certain things as “real” when they are just as illusory as the beliefs of a paranoid delusional. The difference is, enough people agree that certain man-made concepts are “real,” so you’re viewed as “normal.” This is good for society overall, but it’s that sort of unquestioning consensus that inhibits your natural creative abilities.