The word "深深" is formed by repeating the single character 深 (shēn), which means "deep". This act of doubling is not merely for emphasis but creates a new, layered meaning through its own structure. Visually and conceptually, the repetition mimics the very idea of depth, it suggests an intensification and extension of the quality, as if one "deep" is echoed by another, plunging the sense further inward or downward, transforming a static attribute into an immersive, penetrating state.