Which architectural firm pioneered the 'inside-out' aesthetic as their signature brand identity, featuring exposed structural and mechanical systems as decorative elements?

In architectural design, building facades often become powerful branding elements that define firms and create visual recognition. The exterior design choices architects make can become their signature style, creating a recognizable brand identity across their portfolio. How well do you know the distinctive branding elements that have made certain architectural firms famous worldwide?

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Renzo Piano and Richard Rogers (Centre Pompidou approach)
Foster + Partners (Apple Store glass cube approach)
Zaha Hadid Architects (parametric fluid forms approach)
Bjarke Ingels Group (BIG) (mountain-like terraced buildings approach)