how there can be different readings of the same text
I am not sure I follow - do you mean why there can be more than one interpretation of a given work?
There can be different readings of almost any sentence, for example:
When did you go to the store?
WHEN did you go ...
when did YOU go ...
when did you GO ...
For the Woman to Child, one might interpret the author has been left with a deep sense of wonder about the miracle she created. Someone else might see it as agony over having brought Rosemary's Baby into the world.
A poem is intended to strike responses from its readers. You hear tomahto, I hear tomayto.
You who were darkness warmed my flesh
where out of darkness rose the seed.
Then all a world I made in me;
all the world you hear and see
hung upon my dreaming blood.
There moved the multitudinous stars,
and coloured birds and fishes moved.
There swam the sliding continents.
All time lay rolled in me, and sense,
and love that knew not its beloved.
O node and focus of the world;
I hold you deep within that well
you shall escape and not escape-
that mirrors still your sleeping shape;
that nurtures still your crescent cell.
I wither and you break from me;
yet though you dance in living light
I am the earth, I am the root,
I am the stem that fed the fruit,
the link that joins you to the night.
Here is the Macneice:
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