Koinobori are fish shaped flags traditionally flown in Japan to celebrate Children’s Day. ( 5th May ). Traditionally, the flags are used to encourage children as the carp can swim upstream. The flags are made by colorful decorated paper, cloth, non-woven fabric etc .The sizes of ‘koi flags’ generally one feet to a few meters long. However, it is flown generally in front of house, school where the children gather.