Which architectural innovation, first widely implemented in the 1900s, revolutionized visual merchandising by allowing products to be displayed behind transparent barriers while still being visible to passersby?

In the world of architecture and retail, innovation in spatial design has transformed how consumers interact with products. Throughout history, certain architectural innovations revolutionized retail spaces and how merchandise is displayed. This poll tests your knowledge about a pivotal architectural development that changed retail visual merchandising forever and continues to influence modern store designs worldwide.

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The display window with plate glass
The open floor plan concept
The enclosed shopping arcade
The revolving door entrance system