Abstract: Synesthesia is the term which means utilizing five senses for better understanding of the space. Using the senses such as sight, taste, smell, etc., we can better understand the surrounding space. In some cases, some senses are used more and some senses are used less. Current research aims at comparing Isfahan Caesarea market and Chehel Sotoun Palace considering the fact that architectural spaces are perceived through five senses. We are going to find which senses are more used in two architectural spaces which are different in terms of usage and why such senses are used. One is a busy and public place as market and the other one is private and specific. How spaces are perceived through our senses? Are all of our senses used or some of them are used? Why some senses are used and in which situations they are more often used? Because various senses are used in understanding different spaces. Presence of these senses helps to have better understanding and perception of the space.