Which famous architectural firm's logo features a hidden mathematical reference to the Golden Ratio (1:1.618) in its design?

Behind every great architectural firm stands a carefully crafted logo that often contains deeper symbolism than meets the eye. These visual identities become powerful brand assets that communicate a firm's philosophy, approach, and values. Test your knowledge of famous architectural firm logos and their hidden meanings in this challenging trivia question!

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Foster + Partners (geometric arrangement of the '+' symbol follows golden ratio proportions)
Zaha Hadid Architects (the stylized 'Z' contains segments proportioned according to Fibonacci sequence)
SOM (Skidmore, Owings & Merrill) (the negative space between letters forms golden rectangles)
BIG (Bjarke Ingels Group) (the three letters are sized according to golden ratio proportions)