The longest wavelength of light that humans can see is red. Like the color of autumn in Japan, like Hinomaru, the “sun disc” on Japanese flag and the torii of Shinto shrines
Hydrangea (Ajisai in Japanese) is the sign of the rainy season in Japan. The flower is adored and honored by most of the Japanese like they do for ume, sakura and irises. Hydrangea themed accessories found in Japan are quite famous. It appears as a popular decorative motif such as in Kimono, woodblock prints, paintings, tableware, jewelry, and other home décor accessories