Our research aims to elucidate the mechanisms that drive the formation, diversification, and evolution of various organismal shapes. We focus on insects, which exhibit exceptional morphological diversity. In particular, using Drosophila as a model, we have performed long-term live imaging to study the shaping process of the adult leg, and we have also analyzed how the cuticle, an extracellular matrix, contributes to the body shape. These investigations have revealed previously overlooked yet essential phenomena that occur during the final shape formation processes. By exploring these phenomena, we are beginning to uncover fundamental principles underlying the formation of complex and diverse organismal shapes.