This lecture discusses the evolution of architecture in France during the 17th and 18th centuries, focusing on the conflict between architecture as ornament and as structure. The instructor highlights the significance of construction in shaping architectural rationalism, emphasizing how this period marked a shift towards prioritizing structural integrity over ornamental design. Key figures such as Claude Perrault and Nicolas-François Blondel are introduced, illustrating their contributions to architectural theory and education. The lecture also examines the impact of the Enlightenment on architectural practices, with a particular focus on the standardization of architectural language and the emergence of new educational institutions. The instructor elaborates on the role of the state in promoting architectural rationalism, showcasing how the integration of engineering principles transformed the architectural landscape. The discussion culminates in an analysis of notable structures, including the Eastern facade of the Louvre and the Church of Saint Geneviève, highlighting their significance in the context of rationalist architecture.