Important insight into a problem can result from cross-disciplinary thinking. And yet, when I read an argument such as Arnhart's, I am often struck by the difficulty of bridging the gaps between disciplines, especially in relation to words that may be commonly used but differentially understood. The word nature is used without definition in many different forms and contexts in Arnhart's paper; and yet, throughout my reading of it, I felt that the author and I had not arrived at a firm and common understanding of the word.