Which sustainable product design innovation allows architectural facades to adapt to changing environmental conditions without using electrical energy?

In the evolving world of architectural design, sustainability has become a crucial consideration. Beyond just energy-efficient buildings, architects are now implementing innovative product designs and materials to create structures that harmonize with the environment. This trivia question explores a groundbreaking sustainable design technique that has revolutionized how architects approach eco-friendly construction.

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Thermobimetal cladding that changes shape in response to temperature variations
Photovoltaic glass that darkens when exposed to direct sunlight
Hydrophobic concrete surfaces that repel water during rainfall
Carbon-fiber reinforced polymers that expand and contract with humidity