The Japanese tea ceremony, also called the Way of Tea, is a Japanese cultural activity involving the ceremonial preparation and presentation of matcha, powdered green tea. In Japanese, it is called chanoyu (茶の湯) or sadō, chadō (茶道). The manner in which it is performed, or the art of its performance, is called otemae (お手前; お点前). Zen Buddhism was a primary influence in the development of the tea ceremony. Tea gatherings are classified as chakai (茶会) or chaji (茶事). A chakai is a relatively simple course of hospitality that includes confections, thin tea (薄茶 usucha), and perhaps a light meal. A chaji is a much more formal gathering, usually including a full-course kaiseki meal followed by confections, thick tea (濃茶 koicha), and thin tea. A chaji can last up to four hours. Chabana (茶花) is the simple style of flower arrangement used in tea ceremony. Chabana has its roots in ikebana, an older style of Japanese flower arranging, which itself has roots in Shinto and Buddhism. Chabana evolved from the “free-form” style of ikebana called nageire (投げ入れ), literally “throw (it) in”, which was used by early tea masters. Chabana is said, depending upon the source, to have been either developed or championed by Sen no Rikyū. He is said to have taught that chabana should give the viewer the same impression that those flowers naturally would give if they were [still] growing outdoors, in nature. Chabana arrangements are so simple that frequently no more than a single blossom is used; this blossom will invariably lean towards or face the guests.