Presents a selection of classic koans in order of ascending difficulty and accompanied by brief explanations. "Koan is the study case given to the Zen student by his master to sweep away the clouds of unknowing and allow enlightenment to occur. Far from being logical questions, koans are impossible conundrums to which there is no parallel in the literature of any other religion"--Cover.

"Selections from ... the Gateless gate (Mumonkan) and the Blue cliff records (Hekiganroku)"--Pref.

Introduction -- The Zen koan -- The gateless gate -- The blue cliff records.