Which architectural element became a signature brand identity component of Frank Gehry's design firm, appearing in most of their major projects since the late 1990s?

In the world of architecture, brand identity extends beyond logos to encompass signature design elements, material choices, and spatial experiences. Leading architectural firms often develop distinctive visual languages that make their buildings instantly recognizable. This trivia question explores how one famous architect's firm has evolved its brand identity through consistent design philosophies across different projects.

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Undulating titanium panels that create fluid, reflective surfaces
Perfectly symmetrical glass pyramids with gold-plated frameworks
Exposed concrete columns with embedded LED lighting systems
Hanging gardens integrated into geometric steel frameworks