Which architectural firm's logo correctly represents its brand identity?

In the world of architecture, corporate logos and brand identity often become intertwined with the buildings themselves. Some architectural firms have created distinctive logos that represent their design philosophy and approach. This poll tests your knowledge about the connection between architectural practices and their visual branding strategies. Can you identify which famous architectural firm is correctly paired with its logo concept?

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Foster + Partners - Their logo features a stylized 'F+P' with negative space creating an implied building silhouette
Zaha Hadid Architects - Their logo incorporates a red spiral representing the Guggenheim Museum Bilbao
BIG (Bjarke Ingels Group) - Their logo shows a minimalist drawing of the Sydney Opera House
SOM (Skidmore, Owings & Merrill) - Their logo features three interlocking triangles representing the firm's three founding partners