“Swimming in the Woods” by Robin Robertson:
Her long body in the spangled shade of the wood
was a swimmer moving through a pool:
fractal, finned by leaf and light;
the loose plates of lozenge and rhombus
wobbling coins of sunlight.
When she stopped, the water stopped,
and the sun re-made her as a tree,
banded and freckled and foxed.
Besieged by symmetries, condemned
to these patterns of love and loss,
I stare at the wet shape on the tiles
till it fades; when she came and sat next to me
after her swim and walked away
back to the trees, she left a dark butterfly.