"Chado" is "the way of tea." In Japan it is an art form and a deeply revered practice intimately connected with the Zen elements of harmony, reverence, purity, and tranquility. Because the character for "harmony" can also be read as "gentleness of spirit" it seems paradoxical that the samurai should have developed a great fondness for tea. But this is the case. It was always understood however that one's sword would be left outside the tea room -- hence the position of the sword is indicative of peace. Other elements in the painting are drawn from the design of hand guards ("tsuba") for the Japanese sword -- tea room windows, cherry blossoms, the crescent moon in clouds, etc.