Definition
A Zen koan is a short story, dialogue, question, or statement used in Zen Buddhism as an object of meditation. Famous examples: Joshu's mu (does a dog have Buddha-nature?), Hakuin's "the sound of one hand clapping," and Mumon's collection in The Gateless Gate (1228). Koans are designed to defeat ordinary discursive thought and prompt direct insight.
Why it matters
How it works
A teacher presents a koan to a student. The student meditates on it, often for years. The "answer" is not verbal — it is a transformation in how the student approaches the question. Many Zen lineages use koan study formally, with the teacher testing the student's response. The Hofstadter reading: a koan reveals that the question presupposes a framing the answer cannot satisfy; the right response is to dissolve the question rather than answer it.