The meaning that coral possess'

A coral reef basked in the sun gives a shining rainbow color to the Okinawan sea. The beautiful sea variegated with blue, green, violet and other colors is considered to be a gift from nature dyed by a coral reef.
Coral is said to bring us good luck and happiness from ancient days.
The coral dyeing method represents the attractiveness of coral itself. When coral is laying eggs, on the night of a summer's full moon, one can view a spectacular scene in the ocean like a magical snow falling. From the numerous eggs that are layed by the coral, the prospering descendants born from that coral continue to live for months and years which was then associated with longevity. That appeal was then applied to coral dyeing.