The speaker describes being stuck in a loop they can't control. Their legs are locked together, they dislike it, yet they feel they are the one forcing it. The central image is a room of fragile vases and a rock the speaker holds. Every throw breaks something, the vases repair themselves, and the rock returns. Nothing ever changes.
The vases seem to stand for other people, or perhaps for parts of the speaker's own life, since they are "all different but all just as fragile." The rock may represent anger, pain, or a destructive urge. The poem suggests the speaker feels they have only two choices: hold it or throw it. The darker alternatives, choking or hitting themselves, are described as options they are "unwilling" to take.
The mood is tense, helpless, and suffocating. The short lines and the list of "thoughts racing / breathing / heart beating" feel like panic. The ending, "Screaming / Nothing," leaves us with a cry that goes unheard.