Sen no Rikyū was a Japanese tea master with profound influence on the Japanese 'Way of Tea' (chadō). He is considered the historical figure with the most profound influence on the development of this cultural practice. Rikyū emphasized the principles of harmony (wa), respect (kei), purity (sei), and tranquility (jaku). His teachings and aesthetic, known as wabi-cha, continue to define the Japanese tea ceremony to this day.