Rumi isn't merely celebrating romantic love here—he's describing how another person becomes our teacher in the most intimate sense, reshaping us at a level deeper than conscious choice. The image of dancing *inside the chest* suggests something more unsettling than passion: an internal transformation so complete that the beloved inhabits our very biology, our hidden self. What makes this radical is that he locates the beloved not in memory or imagination, but in the body's secret chambers, where no performance is possible. When you catch yourself humming a song your child sang weeks ago, or adopting a friend's particular laugh without noticing, you're experiencing this same possession—the way people become part of our internal choreography, shaping how we think and feel when no one is watching.