In "Masque," why does the poet begin in the first person then change into the second person? MasqueIm standing back, now, looking back at last on...

Strictly speaking, this
poem is written in the first person alone, as the first line indicates:

I'm standing back, now...

If
this poem did contain parts that were written in the second person, we would see that the poem
contains lines that just focus on the action of the "you" and nothing else. However,
you are right in indicating that there is a shift in this poem as the speaker begins to talk
about herself (if it is a she), and...