Which architectural feature of Frank Gehry's Guggenheim Bilbao was specifically designed to become its signature brand element and is now featured in all their marketing materials?

Frank Gehry's design for the Guggenheim Museum in Bilbao, Spain revolutionized how cultural institutions approach architectural branding. This iconic structure not only transformed a declining industrial city into a global tourist destination but created the concept of 'The Bilbao Effect' - where spectacular architecture is used as a catalyst for economic revitalization and brand recognition. Test your knowledge about this landmark example of architectural branding that changed how cultural institutions market themselves worldwide.

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The titanium-clad undulating exterior surfaces
The central glass atrium with spiral staircase
The riverside promenade entrance plaza
The minimalist concrete exhibition galleries