No one has yet made a list of places where the extraordinary may happen and where it may not. Still, there are indications. Among crowds, in drawing rooms, among easements and comforts and pleasures, it is seldom seen. It likes the out-of-doors. It likes the concentrating mind. It likes solitude. It is more likely to stick to the risk-taker than the ticket-taker. It isn't that it would disparage comforts, or the set routines of the world, but that its concern is directed to another place. Its concern is the edge, and the making of a form out of the formlessness that is beyond the edge.
Mary Oliver, Upstream