There is a Japanese legend of an extraordinary strong child ‘Kintaro’, who caught a carp, taller than himself, only with his arms. Carp are familiar to people all over Japan as Koinobori (carp streamer) that is put up in May for their children's healthy growth. In this drawing, Kintaro is showing his extraordinary grip that acts as an external force to drive cellular convergent extension (a process in which a tissue is elongated along a certain axis by cell intercalation in animal development) to elongate the carp's body. The progression status of the convergent extension can be observed by the pattern of the carp's colored scales. Designed by TRAIS Co., Ltd. (Kobe, Japan)