This lecture continues the discussion on the aesthetic principles of High-Tech architecture, focusing on how technology, structure, and services become visible components of architectural expression. It explains ideas such as bright flat colouring for functional clarity, the use of colour coding for building services, and the development of the “silver aesthetic” in later High-Tech buildings. Through examples like the Renault Distribution Centre, Schlumberger Research Centre, and the Millennium Dome, the lecture demonstrates the use of lightweight tensile structures, modular “kit-of-parts” construction, and highly flexible interior spaces. It also highlights the movement’s optimistic confidence in science and technology, where buildings openly display their engineering systems as symbols of technological progress and innovation.