Metamorphosis: Metamorphosis Taking Place Involving Gregor and Its Effect on Metamorphosis. This means a change in form, structure, or appearance. Change is a major theme throughout Franz Kafka's novella, The Metamorphosis. There is a significant relationship between the title, The Metamorphosis, and the theme of change. Kafka's main character, Gregor Samsa, undergoes many changes and his transformation evokes change in his family. Several metamorphosis take place involving Gregor. First, a physical change occurs "When ....