I think it's fascinating how the form plays with its near-symmetries. All those identity rhymes locked in place...but then some of them disappear...and then they come back, sort of (no/know!). The stanzas have a simple 6-line pattern...which swells unobtrusively to 7, about the time you stop counting...then ducks back into 6 before the end.
In a poem about reflection, projection, illusion, it's as if the form itself were enacting a shimmering mirrored surface--symmetries that are broken just slightly, just enough to create a sense of instability.
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