This is a city half-seen and half-recollected, one version overlaid imperfectly on the other, mapping where the past and the present intersect – a fictional city, then, one that is, in a sense, conjured up by the desire to find some lost incarnation of what was once familiar – a desire that will never, ultimately, be realized.

It is a collision
Not an accident, but a crush
between yourself
and the light
and what stands
in between you,
the two of you:
the black dog,
the white dog,
the him and her,
of the moment
you did not remember
taking.
- from The Return of not Returning by Mary Di Lucia

This collection from Igor Posner is from his book Past Perfect Continuous.