Sadō - the way of tea - is the art that perhaps best expresses the Japanese tradition of hospitality. Rules for each action, from whisking and serving the tea to any movement made in the tea room, are designed in accordance with the four key principles of sadō - harmony, respect, purity, and tranquility. Constant practice in the etiquette of making and serving tea develops the spirit of sadō. This old and subtle Japanese art is now becoming popular worldwide.