Which architectural element has become a signature brand identity component for Frank Gehry, appearing in many of his most famous buildings?

In the world of architecture, brand identity often extends beyond logos to the physical elements incorporated into building designs. Many renowned architecture firms have developed signature elements or approaches that make their buildings instantly recognizable. This poll tests your knowledge of how architectural firms create distinct brand identities through consistent design elements across their projects.

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Undulating titanium panels with a reflective finish
Cantilevered glass boxes stacked in irregular patterns
Exoskeletal diagrid structures with hexagonal patterns
Perforated concrete screens with arabesque motifs