Koinobori are colorful carp-shaped windsocks traditionally flown in Japan to celebrate Children's Day on May 5th. These decorations symbolize the hope that children will grow strong and healthy, much like the carp that swim upstream. The koinobori are typically made of fabric and come in various sizes, with the largest often representing the father carp and smaller ones representing the mother and children. The custom of flying koinobori dates back to the Edo period and has become a beloved cultural practice. Families display these vibrant banners outside their homes, creating a festive atmosphere that honors the spirit of childhood and family unity.