There are different kinds of shadows.
The blind ones
are the shadows of things.
These are the tame shadows—
they love to play on the wall with you
and follow you about like cats and dogs.
Sometimes
they hiss at you softly
like snakes that do not bite,
or swish like women's dresses,
but if you poke a candle at them
they pull in their heads and disappear.

But there is a shadow
that is not the shadow of a thing...
it is a thing itself.
When you meet this shadow
you must not look at it too long...
it grows with your looking at it...
till you are all alone
with nothing around you...
nothing... nothing... nothing...
but a shadow
with its eyes full of black light.