The conversation explores daylight as an intangible architectural material, intertwining with various invisible elements such as shadows, air, temperature, human activities, and ideas; interplaying with tangible substances like concrete, brick, steel, wood, or glass. The tangible and the intangible, together, form architecture that is both seen and felt. By shaping the physical, architecture gives form to the intangible: space, atmosphere, usage, human interaction, activity, and perception.