This lecture explores modern residential architecture through iconic glass and steel houses, focusing particularly on Pierre Koenig’s Case Study House No. 22 (Stahl House) and Philip Johnson’s Glass House. It discusses how modern architects experimented with open plans, transparency, industrial materials such as steel and glass, and strong connections between interior and landscape. The lecture highlights design features such as panoramic city views, free-flowing interiors, minimal structural systems, and floor-to-ceiling glazing, which blur the boundary between indoors and outdoors. It also compares Johnson’s Glass House with Mies van der Rohe’s Farnsworth House, showing how modern residential architecture evolved through ideas of simplicity, structural clarity, and spatial openness.