How are the metaphysical aspects conveyed in full moon and little rieda poem?

Here's the poem:

A cool small evening shrunk to a dog bark and the clank of a bucket - 
And you listening. 
A spider's web, tense for the dew's touch. 
A pail lifted, still and brimming - mirror 
To tempt a first star to a tremor. 

Cows are going home in the lane there, looping the hedges with their warm 
wreaths of breath - 
A dark river of blood, many boulders, 
Balancing unspilled milk. 
'Moon!' you cry suddenly, 'Moon! Moon!' 

The moon has stepped back like an artist gazing amazed at a work 
That points at him amazed.

Frieda is Ted Hughes' daughter; she is the "you" who is "listening" in line 2 and the "you" who cries "Moon!" in the 2nd stanza.  So, we have a poet observing a daughter observing the full moon.  And, in the last stanza, the moon is observing them (namely Frieda), like an artist who has just finished a painting.

The metaphysical conceit works on three levels: father observing child; moon observing child; poet observing them all.  The first two stanzas are primarily physical; it is the third stanza that transcends the physical and enters the metaphysical.  Hence, the moon is personified as an artist who is as thrilled to see Frieda's joy at seeing the full moon poet Hughes is.

It is this symbiosis between nature and man and between poet and subject and artist and subject that allows the poem to go beyond the physical.