The sycamore seed is is a seed in the fairy tale "Sycamore Seed" written by Ye Shengtao. In the story the sycamore seed was a swallow that held the sycamore seed in one bite.

The fairy tale is a kind of fictional story with strong fantasy color, mostly using exaggerations, anthropomorphisms, symbols and other expressive methods to weave strange plots. Fantasy is the basic feature of fairy tale, but also the fairy tale reflects the life of the special artistic means. Fairy tales mainly depict virtual things and realms, and the "characters" appearing in them are not real imaginary images, and the stories they tell are also impossible. But all kinds of fantasy in the fairy tale, are rooted in reality, is a refraction of life.