More Information about the Poet: Kay Ryan
The quote kind of summarizes the entire poem, "...one sometimes does have a sense that / There is a double floor someplace..." yes, the speaker does sense the "doublefloor" but the speaker uses different images to define the idea.
The dual pupiled
frog eye can
scan for food
above and below
the water at once.
The key for this stanza is what the frog is looking out for as the idea, the term "doublefloor" has been hinted at. Yes, the frog can look above and below but for the purpose of looking for food and trouble. "food" and "trouble" are ambiguous terms, but specific needs.
But, the poem is focused on the definition, "Many forms of / doubleness serve / local purposes" they key to this stanza is "local." here the speaker is announcing more of a specific area, but the poem goes universal. What does this mean? Once again the duality is played up of senses and of reading:
lulling us to
the moment the speaker uses "us" the poem expands outward. Universal (collective consciousness) based upon "focal baffling" -- a too focused (perhaps singular) confusion. The couplet at the end, "how the splits / keep happening" Food and trouble, local and universal, confusion and clarity. These concepts aren't separate and inhabit the same space.