Which architectural firm is known for using a distinctive bright red color as the primary element in their brand identity and logo?

The visual identity of architectural firms often reflects their design philosophy and approach to the built environment. Major architectural firms invest significantly in their brand colors, logos, and overall identity to stand out in a competitive market. Test your knowledge about the brand colors of famous architectural firms and see if you can identify which color palette belongs to one of the world's most influential architectural practices.

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Foster + Partners
REX Architecture
Kohn Pedersen Fox (KPF)
SOM (Skidmore, Owings & Merrill)