What do the tricks in "Morning Glory" written by Ye Shengtao mean?

Hello! The "old trick" refers to the phenomenon that the tip of the morning glory hangs upside down, and the tender strips are once again "lifted up and stretched like snake heads, entangled with the tender strips of other groups". "Trick" often refers to acrobatics, tricks or deceptive techniques, which are applied to morning glory to give it a sense of initiative and show the author's love for morning glory.