The introduction of blue gi colors in judo competitions is a topic of great interest among enthusiasts and experts alike. But what lies behind this trend? Is it merely a matter of personal preference, or is there a deeper reason for the widespread adoption of blue as the primary color? In Japan, where judo originated, there are several historical and cultural contexts that may have contributed to the use of blue gi colors. One possible explanation is that blue was considered a symbol of good luck and prosperity in Japanese culture. During the Edo period (1603-1867), blue was also associated with the sun goddess Amaterasu, who was revered as the embodiment of divine power. Another theory suggests that the use of blue gi colors may have been influenced by the Japanese concept of "musha no ki," or the "bodyguard spirit." According to this concept, a martial artist's strength and confidence are reflected in their attire, and the blue color is believed to represent courage and determination. This idea may have been perpetuated through traditional judo practices and cultural traditions. Furthermore, some researchers suggest that the adoption of blue gi colors may be linked to the influence of Western judo, particularly from the 1970s onwards. As judo spread globally, many schools began to incorporate blue as a primary color, possibly due to its symbolic associations with power and strength. This trend has continued to this day, with many modern judo championships featuring blue gi attire.