Koinobori are carp-shaped wind socks that are traditionally flown in Japan on May 5th to celebrate Children's Day, a national holiday. The carp are different colors for different members of the family. Black for fathers; blue and green for children; and orange for mothers.

Keishu Takeuchi, 1861-1942. Takeuchi studied drawing under Masanobu Karino and Yoshitoshi Tsukioka and started illustrating novels around 1887. He created illustrations for novels by Koyo Ozaki; Bizan Kawakami; and the popular writer Koyo. After illustrating Sazanami Iwaya, a fairy tale by his contemporary Kenyusha, Takeuchi drew many Japanese-style illustrations for children's magazines.