Which revolutionary building material, developed in 1824, became known as 'Portland cement' and fundamentally transformed modern architecture?

Behind every iconic structure lies a story of innovative materials that revolutionized architecture. This poll tests your knowledge about a famous product that transformed modern building design and continues to influence architectural aesthetics today. Can you identify the correct material based on its origin and impact on architectural history?

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Joseph Aspdin's limestone and clay mixture that became the foundation for reinforced concrete construction
Henry Bessemer's steel manufacturing process that enabled the first skyscrapers
Louis Comfort Tiffany's stained glass technique that created the distinctive Art Nouveau facades
Alvar Aalto's bent plywood method that launched the Scandinavian architectural movement