That rock is a rock because of all the things you know to do to it. I call that DOING. A man of knowledge, for instance, knows that the rock is a rock only because of DOING, so if he doesn't want the rock to be a rock all he has to do is NOT-DOING. See what I mean?
-- The Yaqui Indian sorcerer don Juan Matus to Carlo Castaneda in Journey to Ixtlan