On Defensive Architecture: The Expansion of Boundaries and the Reshaping of the Environment

Physical boundaries always being considered to play a crucial role in past defense systems. Layers of defensive networks were formed by clearly defined internal and external boundaries. However, this traditional defense process also relied on its internal survival logic and complex spatial design. This article aims to study the process that boundaries of defensive architecture constantly broken and reshaped over changing environments. However, this article will not focus on how advanced the defensive technology or how strong the structural engineering of fortifications is. Instead, it traces the concept framework of defensive structures and discusses how fortifications` boundaries have exploded through warfare, inheriting these concepts, while also examining how conceptual shifts allowed defense systems to transcend traditional physical walls and extend into broader spatial contexts in contemporary warfare. This conceptual design would never constrained by the limitations of space or physical properties. By analyzing the layout of trace italienne and modern radar systems, we gain a deeper understanding of how the boundaries of defensive spaces are defined and expanded. This conceptual understanding is enlightening for the formation of defensive spaces, it allows us to break free from the limitations of physical space and consider the possibilities of contemporary defensive system.