In Japan, the arrival of May is heralded by the appearance of flying fish: carp-shaped windsocks known as “Koinobori” flown in honor of Children’s Day or “Tango no Sekku” (originally Boy's Day) on May 5th. The carp is considered the strongest and most spirited of fish, because it fights its way upstream against strong currents. The tradition of flying Koinobori outside homes began as a way to honor the sons living within so that they would grow up healthy and courageous like a carp. Modern Koinobori are often available in sets that represent the entire family. Block printing, specifically wood block, also has deep roots in Japanese art.