Omotesenke (表千家) is one of the schools of Japanese tea ceremony. Along with Urasenke and Mushakōjisenke, it is one of the three lines of the Sen family descending from Sen no Rikyū, which together are known as the san-Senke or "three Sen houses/families" (三千家).
The front gate to the Omotesenke Fushin'an estate, Kyoto.
Kashō-ken (華松軒) tea house used by the Omotesenke school in Gifu, central Japan
Instructions by the 8th iemoto Ken'ō Sōsa on how to clean the frame (robuchi) of the fire pit (ro)
"Schools of Japanese tea" refers to the various lines or "streams" of Japanese tea ceremony. The word "schools" here is an English rendering of the Japanese term 'ryūha' (流派).
Sen no Rikyū, who perfected the wabi-cha manner of tea and was the founder of the Omotesenke, Urasenke, and Mushakojisenke tea families (portrait by Hasegawa Tōhaku)