For a similar pebble bottle with attractive brown skin see Robert Kleiner, Chinese Snuff Bottles in the Collection of Mary and George Bloch, London, 1995 (published to accompany an exhibition at the British Museum), p. 125, no. 73, where the author notes, "This pebble has simply been hollowed and polished. The feeling of, therefore, being directly in touch with nature is greatly enhanced, a feeling the culture of the literati was ever seeking within these works of art"