After much more searching I did turn up a few Bronk poems, though not the one I mentioned. Still, I have fond memories of reading this one for the first time when I was living in France in 1982.
Metonymy as an Approach to a Real World
Whether what we sense of this world
is the what of this world only, or the what
of which of several possible worlds
--which what?--something of what we sense
may be true, may be the world, what it is, what we sense.
For the rest, a truce is possible, the tolerance
of travelers, eating foreign foods, trying words
that twist the tongue, to feel that time and place,
not thinking that this is the real world.
Conceded, that all the clocks tell local time;
conceded, that "here" is anywhere we bound
and fill a space; conceded, we make a world:
is something caught there, contained there,
something real, something which we can sense?
Once in a city blocked and filled, I saw
the light lie in the deep chasm of a street,
palpable and blue, as though it had drifted in
from say, the sea, a purity of space.
© William Bronk. from The World, the Worldless (1964).