Which architectural element became such a signature part of Frank Gehry's brand identity that it influenced his firm's logo design?

In architectural practice, brand identity extends beyond logos to include signature design elements that make a firm's work instantly recognizable. These distinctive features become part of a firm's visual language and help establish their position in the market. Test your knowledge of how famous architects have created recognizable brand identities through their consistent design approaches.

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Curved titanium panels
Cantilevered glass boxes
Concrete honeycomb patterns
Perforated steel screens