Which innovative product design concept revolutionized sustainable architecture in the early 2000s by integrating photovoltaic cells directly into building materials?

The field of architecture has always been shaped by innovative product design. From structural elements to finishing materials, the evolution of architectural products has transformed how buildings are conceived and constructed. This trivia question explores a significant turning point in architectural product design that changed the industry's approach to sustainability and energy efficiency.

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Building-Integrated Photovoltaics (BIPV)
Structural Insulated Panels (SIPs)
Electrochromic Smart Glass
Cross-Laminated Timber (CLT)