This is whatever can be measured between us.
For instance, two birds share one sign, tail feathers
touching, heads back in song, a heart of gray sky framed
between them. But look again, for each line clocks
a difference. One breaks off, another begins; attention is
in the details–then it’s back toward this upward glance
into some larger change of one bird now missing,
the gray heart gone, and the sky, cold and clear. There.