Which famous architecture firm's logo was designed by Pentagram and features a distinctive red square that represents the firm's name?

The visual identities of architecture firms often reflect their design philosophy and approach to the built environment. Behind these iconic logos are fascinating stories of brand evolution that mirror the firms' architectural journeys. Test your knowledge of how some of the world's most influential architecture practices have branded themselves in a competitive market landscape.

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