What Is a Kōan? Riddles That Are Not Riddles
A monk asked master Zhaozhou: “Does a dog have Buddha-nature, or not?” Zhaozhou said: “Mu.” — No. Nothing. Not.
That exchange, case one of the thirteenth-century collection called the Gateless Gate (Mumonkan), is the most famous kōan (公案) in Zen. Generations of students have sat with that single syllable for years. Clearly, something other than trivia is going on.
Not a riddle, not a metaphor
The word kōan originally meant a “public case” — a legal precedent. In Zen it came to mean a recorded encounter, question, or saying used as an object of practice. It is tempting to treat kōans as riddles with clever answers, or as metaphors to decode. Both moves miss. A riddle is solved by the discursive mind; a kōan is designed to exhaust the discursive mind — to bring you to the point where explanation fails and something more direct has to take over. Wumen, the compiler of the Gateless Gate, wrote that the practitioner should become the question with the whole body, “like someone who has swallowed a red-hot iron ball: you cannot spit it out, and you cannot swallow it down.”
Famous cases
- Zhaozhou’s Mu — the case above; usually the first kōan given.
- The sound of one hand — Hakuin’s question: you know the sound of two hands clapping; what is the sound of one?
- Your original face — “Show me the face you had before your parents were born.”
- Wash your bowl — a monk asks Zhaozhou for instruction; Zhaozhou asks if he has eaten his rice gruel. “Yes.” “Then wash your bowl.”
How students actually work with a kōan
In formal training, a teacher assigns the kōan, and the student carries it into zazen — holding the question through the breath, beneath thought, sometimes for months. Progress is tested face to face: the student presents their understanding in private interview (dokusan), and the teacher probes, rejects, redirects. The kōan curriculum is not a syllabus of ideas but a sequence of doors, each opened in the body before the next is offered.
Reading about kōans — including this page — is like reading about swimming. Useful, perhaps, but only up to the water’s edge.
Where to meet the texts
The classic kōan collections — the Gateless Gate, the Blue Cliff Record, the Book of Serenity — are old enough to rest in the public domain, and public domain translations exist. They are short books and bottomless. MyRoshi teaches them case by case: a daily teisho on the classics from an AI teacher who checks — by asking you to answer aloud — what actually landed, and builds the next talk on that. The first seven days are free.
Practice, not just reading: MyRoshi is a daily zendo — zazen with bells, then a teisho on the classics from a teacher who adapts to how you understand. Begin with 7 free days.