"Dancers Exercising" by Amy Clampitt

I found this poem on poetryoutloud.org which is a great poetry recourse. And I'm obsessed with the first sentence of this poem. This is a poem which begs to be read out loud, hence it being found on poetryoutloud.org. So don't disappoint the poem. Read it out loud...

"Dancers Exercising" by Amy Clampitt

Frame within frame, the evolving conversation
is dancelike, as though two could play
at improvising snowflakes’
six-feather-vaned evanescence,
no two ever alike. All process
and no arrival: the happier we are,
the less there is for memory to take hold of,
or—memory being so largely a predilection
for the exceptional—come to a halt
in front of. But finding, one evening
on a street not quite familiar,
inside a gated
November-sodden garden, a building
of uncertain provenance,
peering into whose vestibule we were
arrested—a frame within a frame,
a lozenge of impeccable clarity—
by the reflection, no, not
of our two selves, but of
dancers exercising in a mirror,
at the center
of that clarity, what we saw
was not stillness
but movement: the perfection
of memory consisting, it would seem,
in the never-to-be-completed.
We saw them mirroring themselves,
never guessing the vestibule
that defined them, frame within frame,
contained two other mirrors.

Found at: http://www.poetryoutloud.org/poems/poem.html?id=179051