Which innovative sustainability feature was incorporated into the Oslo Opera House design, making it a landmark example of eco-friendly performing arts venues?

The architecture and design of performing arts venues have evolved dramatically over the centuries, incorporating technological innovations that enhance both the artistic experience and sustainability. This poll tests your knowledge about a groundbreaking sustainable design feature in one of the world's most renowned contemporary performing arts centers, showing how the industry is embracing environmentally conscious practices while maintaining artistic excellence.

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A roof design that allows visitors to walk on top, doubling as public space while providing natural insulation
Underwater stage mechanics powered entirely by tidal energy from the adjacent fjord
Acoustic panels made from recycled musical instruments collected from around the world
Self-sustaining biosphere that grows all organic food served in the venue's restaurants