Fuzzy Logic theory has been used in different areas, but it was in engineering and specifically in the control area where the first applications were made, allowing the introduction of human perceptions in real processes. In general, engineers have not given importance to its roots, so this paper examines and compares through different ages, both in the Eastern and Western thought, in order to be able to present a non engineering vision of fuzzy logic. The analysis includes both ancient Greek and Chinese philosophies, which were developed in parallel about 500 years B.C, and their significant roles in the reasoning and behavior of human beings. The differences between the reasoning methods stand out why the fuzzy logic wasable to penetrate faster in Eastern Asia than in the West. This vision is important and helpful for all those that implement Fuzzy Logic in different engineering areas since it allows connecting its application with its bases.