In Elizabeth Bishop's poem "The Fish," is the expression "everything was rainbow, rainbow, rainbow!" abstract or concrete?

Typically, 's
poetry is pictorial, not only in
the sense of giving vivid descriptions of natural phenomen, but
also in the
poem's use of such objects that reflect on the self referential.  Thus, the
rainbow
represents victory for both the fish and its capturer.  In her
delicacy of language, however,
Bishop does not overtly communicate what this
victory encompasses.  Instead, in her poem
","
she employs ambiguity "rainbow, rainbow, rainbow."  Beauty comes from

destruction.

Yet, in the victory of both the fish and its capturer,
the
exclamation becomes both abstract and
concrete . As in a painting,
the rainbow is concretely visible
on the fish, while it is felt by the capturer who has caught
it, relishing
her victory over catching such a venerable fish who has escaped other fishermen
as
well as the fish's ability to have eluded capture so many times. The
emotions are metaphorically
a rainbow as the capturer
experiences...