Which architectural firm's logo features a hidden reference to the Golden Ratio in its design?

The visual identity of architectural firms often contains subtle references to design principles, famous structures, or the philosophy of the practice. These logos are carefully crafted to represent the firm's approach to architecture while remaining memorable and distinctive. How well do you know the stories behind some of the world's most respected architectural brand identities? Test your knowledge of architecture industry logos and their clever hidden meanings!

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Foster + Partners (with its interconnected squares forming a phi ratio)
Zaha Hadid Architects (with its flowing Z incorporating the 1.618 proportion)
Studio Libeskind (with its angular L based on the Fibonacci sequence)
Snøhetta (with its mountain silhouette following golden proportions)