Which innovative building material, first used extensively in the early 20th century, revolutionized architectural design by allowing for open floor plans and taller structures without thick supporting walls?

The early 20th century witnessed a revolution in architectural design and construction techniques. This era saw pioneering architects challenge traditional notions of building design through innovative materials and methods. This trivia question explores a pivotal moment in architectural product innovation that fundamentally changed how we conceptualize and construct buildings today. Test your knowledge of the transformative materials that shaped modern architecture!

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Reinforced concrete
Glass curtain walls
Prefabricated steel frames
Laminated timber