A carpenter's hammer is about as ordinary a sound as there is, and Dave Bonta's poem starts there, on a clear September afternoon, and then lets the sound travel a very long way. By the end, a building site in the woods has been linked to the sky itself. The central idea is that human making and natural force echo each other, and that one small noise can hold centuries of history.
The poem's shape is its most striking feature. The first stanza is a single sentence, and its main verb, "reminds," doesn't arrive until the line after the stanza ends. Until then we are held in suspense while the sentence piles up its phrases. There is no rhyme and no regular metre. The poem is held together by repetition instead. The word "on" returns again and again, and each short line lands like a hammer stroke: "on planks / on studs / on beams." The nouns are blunt one-syllable or two-syllable building words, and the hard consonants in "bang," "planks" and "beams" make you almost hear the work.
What makes this list clever is the direction it moves in. It begins with nails and climbs through the parts of a house, then drops to "a foundation" and finally "a hole in the ground." The building is traced back down to the earth. At that point the grammar changes. "On" gives way to "in": "in a clearing in the woods / in a hollow." The camera pulls back from the surface being struck to the place that holds it. Then comes a third preposition, "to": "to make charcoal / to forge iron nails." Now the poem looks back at purpose and cause. The sequence moves from striking to containing to making, and the last line brings us back to nails, the very thing the hammers were hitting in line two. The first stanza is a circle. The woods were cut down so that nails could be made, and now nails are going into a new structure in the same spot. The phrase "first lumbered 200 years ago" quietly suggests that the trees have grown back and the place is being worked a second time.
The title word, "Hollow," does a lot of work. It first describes the sound, "the hollow bang of hammers." A wooden frame with no walls yet is an empty shell, and it makes an empty, resonant noise. Then the word becomes a noun, a small valley or dip in the land, and the site is "a hollow first lumbered 200 years ago." Close by sits "a hole in the ground," another kind of emptiness. One word thus links the sound, the landscape and the unfinished house, and all three are things waiting to be filled.
The second stanza, only two lines long, releases all that tension with a surprising comparison. The hammering "reminds me of the sound the sky makes / whenever it tries to bolt itself to the earth." The sky sounds like a carpenter, and thunder becomes a kind of cosmic construction. The word "bolt" is especially good, because it is both a metal fastener, like the nails before it, and a lightning bolt. The sky is imagined as a builder attempting to fix itself to the ground, just as the workers fix beams to a foundation. There is a quiet irony too. The afternoon is clear, with no storm, so the sky's thunder has to be imagined and is carried only by the sound of human work.
The speaker's tone is also worth noticing. "Reminds me" is calm and conversational, and the poem makes no grand announcement. The big leap, from planks to heavens, is made lightly, almost as an aside.
That lightness is what makes the poem memorable. In thirteen lines it holds a moment of attention, a stretch of two centuries and an image of the whole sky, without ever raising its voice. It suggests that building is an old, repeated human gesture, the same one the weather seems to make when it tries to join heaven to ground, and that a person who listens closely to an everyday noise may hear all of that inside it.