What is Mu? Why do we constantly return to this not-quite-a-syllable in our Zen practice? In this talk, given at the Zen Open Circle Spring Sesshin, we look at how Mu undoes our habitual thinking and liberates a life of not-knowing. In Japan there is a word, “sa’pari”, which means something like “unblemished by understanding.” What does a life unblemished by understanding afford? Why would we want to draw close to its promise?