Which architectural feature became a signature brand positioning element for Frank Gehry, appearing in most of his celebrated buildings since the late 1990s?

In the competitive world of architecture, firms distinguish themselves not just through their designs, but through strategic brand positioning. Certain architects have created such distinctive visual languages that their work becomes instantly recognizable—a powerful form of brand positioning in the industry. This poll tests your knowledge of architectural signatures that have become defining elements of famous architects' brand identities.

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Undulating titanium panels that create fluid, reflective surfaces
Exposed concrete columns with deliberately visible formwork patterns
Cantilevered glass boxes that appear to float without support
Perforated metal screens creating dappled light patterns