In *Masse, mémoire, simulacre*, François Séguret offers a critical exploration of contemporary architecture through the intertwined lenses of mass, memory, and the simulacrum. Drawing on postmodern theory, Séguret interrogates how built environments function as repositories of collective memory while simultaneously participating in the production of hyperreal spaces that obscure the boundary between original and copy. The work examines the tension between the material weight of architectural forms and their increasingly mediated, image-driven existence in a culture saturated by reproduction and simulation. Séguret's analysis moves across theoretical and architectural terrains, engaging with questions of authenticity, cultural amnesia, and the role of the monument in an era defined by rapid urban transformation. By weaving together philosophical inquiry with close readings of architectural practice, the book provides a nuanced framework for understanding how architecture both shapes and is shaped by the dynamics of mass culture and technological reproduction.