![Picture](/uploads/2/9/0/7/29072671/3190122.jpg?633)
This is a photo of a painting depicting four ladies practicing Chanoyu. Four was the preferred number of guests, though here there appears to be three guest and one host.
http://www.kcpwindowonjapan.com/2011/07/hot-water-for-tea/
http://www.kcpwindowonjapan.com/2011/07/hot-water-for-tea/