The phrase "smooth glass on windless water" comes from Ouyang Xiu's "picking mulberry seeds and crossing the West Lake alone" in the Song Dynasty. In this poem, "smooth glass on windless water" uses figurative rhetoric. The "windless water surface" is compared to "glazed sliding", which vividly depicts the calm and smoothness of the water surface, as if there is no wind, making the lake as smooth as glazed.