Four short lines, and the first thing to read is the title. "Sand bar" suggests a ridge of sand lying just under the water, but it also sounds like a place to order a drink. The third line settles the joke by naming the other bar outright: "the wine bar oysters." The whole poem slides from one meaning of "bar" to the other, from a natural landscape to a social one, and the speaker seems to prefer the first. The central idea is a wry longing for plainness after indulgence: once rich food, drink and a night's consequences have had their say, sand looks like the one honest thing left.
The opening lines are made of the humblest words available. "Good" and "simple" are the adjectives of a child or a very tired person, and the line states its verdict without any decoration. Then comes the odd one: "the only thing like a thing." It sounds almost like a tongue-twister, and it rewards slow reading. Sand is a heap of countless grains, yet the speaker treats it as a single, dependable object. The line can also be read as a small joke about the vagueness of the word "thing," which here means anything solid enough to be named. Judging by the contrast the poem sets up, everything else in the speaker's recent experience has been slippery, and sand is the exception. The repeated word works like the sand it describes: dry, blunt, with no flourish.
The turn comes with "since," and the word is ambiguous. It might mean "because" (sand is good *because* of what the oysters did) or "ever since" (the world has looked different from that night on). Either way, the second half supplies the reason for the first. The oysters are soft, wet and alive, as unlike a grain of sand as food can be. They are also the poem's grammatical subject: the speaker doesn't go to bed, the oysters "brought" him there. The speaker is carried along by appetite and has no control over it, and that helps explain why something fixed and inert like sand is so appealing.
The last phrase, "brought me to bed," is where the poem keeps its secret. Oysters have a long reputation as an aphrodisiac, so the phrase may be erotic. It could equally mean an upset stomach and a retreat under the covers, or simply a drowsy end to a heavy meal. There is even a faint older echo, since "brought to bed" was once an idiom for giving birth, though the poem never pushes that reading. With no punctuation and no capital letters, we get no clue to the tone, and rueful, comic and pleased are all possible. The poem trusts us to hold all of them at once.
The sound is carefully handled even though nothing rhymes. The lines run roughly six, seven, seven and then four syllables, so the poem shortens and drops into its final line like a body onto a mattress. The soft hiss of "sand," "simple," "since" and "oysters" recalls sand running through fingers, while the heavy *b* sounds of "bar," "brought" and "bed" land with a thud in the last two lines. "Wine bar" puts two stressed syllables side by side, which slows the line just before the ending. Small echoes, such as "sand" inside "and" and the doubled "thing," give the poem a quiet internal music that works in place of rhyme.
The poem is significant for how much it gets out of so little. Like a haiku, it is tiny, but it is not tied to any strict form. It does its work through wordplay, ambiguity and tone. A pun in the title reorganises everything that follows, and a single conjunction turns a statement of taste into a small story with a cause. Most of all, it makes a joke that is also an idea: after enough richness, simplicity can feel like a revelation, and the best response to that feeling may be a shrug.