Dali Butterfly Spring, the spring water is as clear as a mirror. Every year during the Butterfly Festival, thousands of butterflies come from all directions and fly all over the sky beside the spring. The butterfly is as big as a palm and as small as a copper coin. Countless butterflies also have hooked legs and whiskers, holding each other head to tail, hanging in a string from the acacia tree to the water. The Butterfly Spring, which Xu Xiake has heard about for a long time, can be summed up in its "three wonders": mountain spring, butterflies, and trees.