It is said to climb waterfalls bravely, and, if caught, it lies upon the cutting board awaiting the knife without a quiver, not unlike a samurai (warrior) facing a sword. This theme dates back to ancient China, where a legend tells of how any koi that succeeded in climbing the falls at a point called Dragon Gate (on the Yellow River) would be transformed into a dragon. Based on that legend, it became a symbol of worldly aspiration and advancement. Eventually, the stoic fish came to be associated with so many masculine and positive qualities that it was appropriated for the annual Boys' Day Festival in Japan where even today colorful, streaming koi flags are traditionally displayed for each son in the family. In tattoo imagery, especially in combination with flowing water, it symbolizes much the same: courage, the ability to attain high goals, and overcoming life's difficulties.