Which famous architectural firm's logo features a stylized red square that represents their philosophy of 'simplicity, modernity, and geometric clarity'?

In the world of architecture, branding and visual identity have become increasingly important for major firms to distinguish themselves in a competitive market. Beyond their buildings, many renowned architectural firms have invested significantly in their brand identity, including memorable logos that represent their design philosophy and approach. Test your knowledge of architectural firm branding with this challenging question!

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Foster + Partners
SOM (Skidmore, Owings & Merrill)
OMA (Office for Metropolitan Architecture)
Zaha Hadid Architects