This lecture covers the concept of imbrication in the context of creating envelope structures, focusing on the process of composition and assembly. Topics include mono and multi-panel components, as well as the regularization of cubes and topological cubes. The instructor demonstrates the modeling and simulation of mechanisms, emphasizing the importance of accurate positioning and real parameter relays. The lecture also delves into the documentation and fabrication aspects of the process, highlighting the significance of proper construction tools and automatic nesting strategies.