This thesis work started during a one year stay for studies in Japan, at the Kengo Kuma Lab of the University of Tokyo, where I found a very stimulating international environment, between professors and students, in the study and reseach. Foundamental in my reseach was also the experience of Japanese life, where among several visits in places and museums in Tokyo and other cities of Japan, but also thanks to my Japanese family, I managed to immerse myself into the culture. Hence the thesis investigates on the importance of the use of patterns in the Japanese culture, analyzing the developments they have had throughout history, the characteristics that distinguish them from the patterns used in other cultures, the different uses of these in different ambits and ways and the profound meaning that the decorative systems assume in tradition, how they are reflected in the fascinating Japanese culture and how they still exist today.