Life is generally lived with a set of illusions we negotiate with the world around us. You know the kind. You're only as old as you feel. We're invincible. "We" are different from "them." We can achieve some sense of stasis where things might forever reside in a place of peace and joy, with pain and discomfort banished safely outside. All very noble illusions indeed, these ideas are safe havens against an otherwise unforgiving reality, it seems. Cognitively, we all know we're really not invincible.