Arousal is not desire. It is not libido, not fantasy, not sex, not even pleasure in its simplest form. It is the organism’s capacity to register significance and reorganise itself in response. It is a shift in state—neurological, hormonal, attentional—where something in the field is marked as different enough to matter . Blood moves. Focus narrows. Prediction sharpens. The body prepares. Without this shift, nothing is pursued with force. Without this shift, experience does no