Which architectural product innovation, first widely adopted in the 1980s, revolutionized building façades by allowing for energy efficiency while maintaining transparency?

In the world of architecture, innovative product design has transformed how structures are conceptualized and built. From sustainable materials to smart building components, architectural product design continues to evolve rapidly. This poll tests your knowledge about a significant design innovation that changed modern architectural practices. Can you identify the groundbreaking product that revolutionized building envelope design?

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Low-E (low-emissivity) glass
Photovoltaic curtain walls
Self-cleaning concrete panels
Carbon fiber structural membranes