A child, left to play alone, says of quite an easy thing, 'Now I am going to to do something very difficult'. Soon, out of vanity, fear and emptiness, he builds up a world of custom, convention and myth in which everything must be just so; certain doors are one-way streets, certain trees sacred, certain paths taboo. Then along comes a grown-up or a more robust child; they kick over the imaginary wall, climb the forbidden tree, regard the difficult as easy and the private world is destroyed. The instinct to create myth, to colonize reality with the emotions, remains. The myths become tyrannies until they are swept away, when we invent new tyrannies to hide our suddenly perceived nakedness. Like caddis-worms or like those crabs which dress themselves with seaweed, we wear belief and custom.