Abstract It is difficult to define perspective within sets that are self belonging. For example in the study of man­kind, anthropology, both men and their studies fall into the same category that contains the topic out­line. This situation entails a universal quality of uniqueness, an instance of it, to the topic of anthropo­logy that may be viewed in parallel with the topic of nature as the set of unique particulars. Yet one might assent to the notion in the inclusive study of m...