What is the climax of "The Lady of Shallot"?

In this fascinating poem a lot seems to be said about the
division between art and life. The Lady of Shallot is trapped or "embowered" in her
tower and left to see life as a pale imitation as mediated through her mirror. She
spends her time recoring life in her embroidery, a "magic web with colours gay." We hear
about the curse that is on her, that if she were to look down to Camelot herself without
using the mirror, her doom would come upon her.

So, quite
clearly, the climax of this poem comes when the Lady of Shallot is so overwhelmed by
reality that she is tempted into looking down at the sight of Sir Launcelot trotting
past her window. Note how he is described with such
vibrancy:

A
bowshot from her bower eaves,

He rode between the barley
sheaves,

The sun came dazzling through the
leaves,

And flamed upon the brazen
greaves

Of bold Sir
Launcelot.

In this poem, we
can see from the dramatic way in which he enters, that he could be said to symbolise the
forces of life and reality. The impact this sight has on the Lady of Shallot is enough
to bring the doom upon her:

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She left the web, she left the
loom

She made three paces through the
room,

She saw the waterlilly
bloom,

She saw the helmet and the
plume,

She looked down to
Camelot.

Note how the
repetition of the phrase "She" functions to increase the dramatic nature of this stanza.
This is the climax of the poem because it results in the irrevocable breaking of the
mirror and her abandonment of her tower.