Dogen Zenji writes, "At the very time of your sitting, you should examine exhaustively whether the total world is vertical or horizontal. At that very time, what is the sitting itself? Is it wheeling about in perfect freedom? Is it like the spontaneous vigor of a leaping fish? Is it thinking? Or not thinking? Is it doing? Is it nondoing?" This sesshin will be a "Genzo-e", a concentrated study retreat on a chapter of Dogen’s Shobogenzo. In this retreat we will investigate together Dogen's understanding of zazen.