This lecture explores the concept of thresholds as porous elements that blur the boundaries between interior and exterior spaces, creating opportunities for new interactions and spatial sequences. It delves into the historical evolution of architectural thinking towards more human-centered and environmentally conscious approaches, emphasizing the importance of designing environments that foster meaningful interactions. The discussion extends to the relationship between buildings and their surroundings, highlighting the significance of creating spaces that are deeply integrated with the landscape. Through examples ranging from ancient temples to modern urban interventions, the lecture emphasizes the role of thresholds in shaping the experience of architecture and the built environment.