What makes this memorable isn't the cheerful surface—it's the optical truth underneath. Whitman isn't suggesting naive optimism; he's describing the actual geometry of attention. When you orient yourself toward light, you stop staring at what obscures you. A person grieving who forces themselves to sit with a friend's laughter, or someone failing at a craft who watches a master at work, experiences this literally: the shadow of loss or inadequacy moves behind them not because it vanished, but because they've repositioned their gaze. The shadows remain; you've simply chosen which direction to face.