The purpose of this article is primarily methodological, aimed at develop-ing suitable methodologies for analyzing the perceptual structure of opposi-tion. The phenomenological internal structures of 37 opposite spatial di-mensions are discussed, based on data collected in two different experi-mental tasks. The data have been previously discussed in terms of non-fuzzy logic (Savardi, & Bianchi, 2000). This paper explores the potential applications of a fuzzy model for reanalyzing the data. The fuzzy struc-tures for the 37 spatial dimensions, which resulted from an indirect method of obtaining membership functions, are presented and discussed.