Classic Poem

Sigh, O thin sigh, through
what crack have you entered?
With a sliding screen,
a thin-framed screen, and
other sliding doors,
a hinge on the sidepost, and,
on the door, a latch fastened with a
clang, a lock, fastened firmly, of
dragon and turtle design,
a hinged screen folded with a
clatter, a scroll rolled
tightly up, through what
crack could you have entered?
Somehow, on nights when
you come, I cannot sleep.