Yes, China, indeed. The fact that they are blackened with age, and not painted in vivid colors as they are in the Forbidden City and at the Temple of Heaven, make a huge difference in terms of meaning. They look ancient, telling us that this wall as been there for a long long time.
Such small details, juxtaposed against the softly focused wall that represents one of the biggest engineering feats of all time. The tiny animals and ancient tiles bring a sense of time to this
amazing structure.