A small scene unfolds at a window: a phoebe, a bird, flies at the screen and clings to it, trying to snatch a spider that sits calmly on the other side. The spider doesn't move, and the bird's beak keeps hitting the mesh. The speaker watches this and reaches for an odd comparison. The screen seems to turn the meal into metal, or into a grid of holes, like the tidy diagrams in a physics textbook. From there the thought drifts to chalk lines on a blackboard and rows of blank faces at desks, as if abstract explanation has gone cold and lifeless.
Then the poem snaps back. "But it was right there," the speaker says, and lists the spider, the phoebe, the rattle of wings. The feeling is a quiet wonder, with a little amusement at the bird's bafflement. The mood suggests that no neat theory quite holds a living moment, which is far more vivid than the lesson that tries to describe it.