Feiyan title table introduction: is listed as the third difficult problem in Huashan. In late spring and even midsummer, pilgrims often stand on Juxianping, praying for God's blessings, and throwing yellow balls into the southwest valley. The yellow watch flew in the air and did not fall for a long time. Then a flying swallow came and carried it away. What's even more wonderful is that when the yellow watch is thrown, it does not fall but rises on the platform. It drifts away, and spring swallows sometimes chase it.