Which architectural innovation is widely credited with transforming modern retail design by introducing the concept of 'streets in the sky' for shopping?

Test your knowledge about groundbreaking architectural innovations that transformed retail spaces throughout history. This poll explores how architectural design decisions have fundamentally changed the way we experience retail environments and shaped consumer behavior. From pioneering department store layouts to modern experiential retail concepts, see if you can identify which architectural innovation truly revolutionized the industry.

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Victor Gruen's enclosed shopping mall design (Southdale Center, 1956)
Frank Lloyd Wright's open floor plan concept for retail (V.C. Morris Gift Shop, 1948)
Louis Kahn's light-focused department store designs (Trenton Bath House influence, 1955)
Ludwig Mies van der Rohe's glass pavilion retail concept (Barcelona Pavilion influence, 1929)