Which innovative building product, first commercially successful in the 1960s, allowed architects to create seamless glass facades on skyscrapers without visible metal frames?

Throughout architectural history, innovative building materials have transformed what's possible in design and construction. From ancient innovations to modern breakthroughs, materials science has pushed the boundaries of what architects can achieve. This trivia question focuses on a revolutionary product that changed architectural possibilities in the 20th century. Test your knowledge of architectural product innovations that have shaped our skylines!

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Structural silicone glazing
Aluminum composite panels
Curtain wall mullions
Low-E glass coating