In Autumn Sesshin's opening Teisho, given on Oct. 1st, 2021, Rinzan Osho examines The Mumonkan, Case 1: "Joshu's No." Traditionally maintained as the Sino-Japanese "Mu" (Chinese "Wu"), Rinzan invites us to work with "No" to wipe away conceptualizations, clinging, preoccupations ... all with a wondering mind. "If not this, then what?"