The speaker begins by admitting ignorance: they don't know how bones form in the womb, where everything happens in darkness. That honest "I don't know" sets the tone for the whole poem. It is less about answers than about standing in front of something too large to explain.
From there, the imagery shifts to sound. Elements "clack," a small house shudders, and the body becomes a kind of instrument, with harp strings and heartbeats that seem to announce a balance between the living body and the forces of heat, wind and rain. The house could be read as the body itself, though the poem leaves that open.
The final stanza turns inward. The speaker asks us to look for "body's love," and a mysterious song echoes back. The closing line, "some truths not spoken," suggests that certain things can be felt but not put into words. The mood is quiet, curious and reverent, with a touch of humility.