Insight into "not-self" (anatta) is one of the core aspects of wisdom. After briefly reviewing some of the challenges of understanding anatta, we look at four practical ways to explore anatta, through focusing on 1) everyday and meditative experiences of "flow", 2) studying the "thick" or strong sense of self when it appears, 3) practicing in other ways to "thin" the self, and 4) opening to awareness without a sense of self or identification with the contents of experience.