Which innovative architectural product, introduced in the early 2000s, allows buildings to respond to environmental conditions by automatically adjusting their transparency?

The architecture industry constantly evolves with innovative building materials and products that transform how structures are designed and built. These innovations often address sustainability concerns, improve efficiency, or create new aesthetic possibilities. Test your knowledge about a groundbreaking architectural product innovation that has changed modern building practices and opened new design frontiers.

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Electrochromic glass (smart glass)
Self-healing concrete
Aerogel insulation
Cross-laminated timber (CLT)