The Japanese fish kite, also known as a 'Koinobori', carp windsocks, carp streamers or carp banners, is a decoration used in Japan From April through early May, in honor of Children's Day on May 5. The carp symbolizes courage and strength because of its ability to swim up a waterfall. The following kite is illustrated in shades of purple. From the Getty Images iStock / 360 collection. Artwork by djpc75.