Which architectural innovation, first widely implemented in the 1920s, revolutionized retail by allowing customers to see merchandise from the street, fundamentally changing visual merchandising?

The intersection of architecture and retail has led to innovative designs that transform shopping experiences. From flagship stores that serve as urban landmarks to immersive environments that blur the line between digital and physical spaces, architects have played a crucial role in retail evolution. This trivia question explores a pioneering architectural innovation that changed how we experience retail spaces.

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The display window with plate glass
The escalator-centered atrium
The open floor plan concept
The skylight-illuminated gallery