Knowledge organization (KO) can be postulated as existing on a continuum between classificatory activity and perception. Studying perception and its role in the identification of concepts is critical for the advancement of KO. The purpose of this research is to advance our understanding of the role of perception in KO systems. We briefly review the role of perception in KO and some preliminary evidence about affective social tagging, which is seen as a form of everyday classification. We consider how Husserlian phenomenology might be useful for analyzing the role of perception in affective social tagging. Finally, preliminary results of an empirical study are reported.