Which architectural firm is known for its signature 'diagrid' structural system that eliminates the need for interior structural columns while creating a distinctive diamond-patterned exterior?

In the world of architecture, distinctive brand identity can transform a building from a mere structure into an iconic landmark. Major architectural firms often develop signature design elements that make their work instantly recognizable worldwide. This trivia question explores how certain architectural features have become synonymous with specific architects and their firms, creating powerful brand identities in the built environment.

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Foster + Partners
Zaha Hadid Architects
Bjarke Ingels Group (BIG)
Skidmore, Owings & Merrill (SOM)