Describe symbolism in Ferdydurke by Witold Gombrowicz

In Chapter Nine, Joey placing the mutilated fly on Zuta's flower is a private defilation. The flower symbolizes love and youth, and the tennis shoe symbolizes the real and physical nature of life. Together, they paint a picture of what's attractive about Zuta. She can be physical and grounded in reality without being crass and dirty. Joey spoils this with suffering and dirt. The association is one for his own mind, not necessarily for Zuta.