Ikebana is the Japanese art of flower arrangement. It was introduced in Japan in the 6th century by Chinese Buddhist missionaries, who had formalized the ritual of offering flowers to the Buddha. The first school of flower arranging in Japan was founded in the early 7th century. The art is based on harmony of simple linear construction and appreciation of the subtle beauty of flowers and natural material (branches, stems). Several major schools, with differing histories and theories of artistic style, exist to this day. In its highest form, ikebana is spiritual and philosophical in nature. More than simply putting flowers in a container, ikebana is a disciplined art form in which nature and humanity are brought together. The artist's intention behind each arrangement is shown through a piece's color combinations, natural shapes, graceful lines, and the usually implicit meaning of the arrangement.