Which architectural retail design innovation, first popularized in the 1990s, revolutionized store layouts by creating a 'store within a store' concept that is now standard in department stores and larger retailers?

In the world of architectural retail design, innovations have dramatically changed how customers experience brands. From traditional storefronts to immersive brand environments, retail architecture has evolved significantly in recent decades. This poll tests your knowledge of a key retail design milestone that revolutionized the industry and influenced countless store layouts worldwide. Can you identify the correct architectural retail innovation that changed the shopping experience forever?

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The shop-in-shop concept (branded concessions)
The open ceiling design with exposed structural elements
The central atrium with multi-level visibility
The exterior glass curtain wall with transparent storefronts