Dhyāna in Buddhism the Japanese Rinzai school, but it also occurs in other schools or branches of Zen depending on the teaching line. The Zen student's mastery of a given kōan is presented to the teacher in a private interview (referred to in Japanese as "dokusan" (独参), "daisan" (代参), or "sanzen" (参禅)). While there is no unique answer to a kōan, practitioners are expected to demonstrate their understanding of the kōan and of Zen through their responses. The teacher may approve or disapprove of the answer and guide the student in the right direction. The interaction with a Zen teacher is central in
Zen at War in relation to "Zen at War" mentions Hisamatsu's impossible question, "What will you do when you cannot do anything, when all your best intentions and great endeavour are invested to no avail whatsoever, when all you do is doomed to fail?", relating it to a statement by Takeo Sato: In response to "Zen at war" Ina Buitendijk started a campaign to receive apologies from leading parties within the Japanese Zen-schools: Her campaign resulted in responses from Kubota Ji'un, third abbot of the Sanbo Kyodan, Hirata Seiko, and Hosokawa, abbot of Myoshin-ji. Kubota Ji'un writes: Hirata Seiki writes: Brian Victoria has