Which architectural retail innovation first introduced the concept of 'streets in the sky' - elevated walkways connecting different shopping areas within a single structure?

The intersection of architecture and retail has produced some of history's most innovative shopping environments. From department stores to modern malls, architectural design has fundamentally shaped how consumers interact with products and brands. This poll tests your knowledge about a revolutionary architectural retail innovation that transformed the shopping experience and influenced store designs worldwide. Can you identify which famous retail concept first introduced this groundbreaking approach to architectural space?

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Victor Gruen's Southdale Center (1956), the first fully enclosed, climate-controlled shopping mall
Frank Lloyd Wright's V.C. Morris Gift Shop (1948), with its spiral ramp design that later influenced the Guggenheim Museum
Le Corbusier's Unité d'Habitation (1952), which integrated retail spaces into residential architecture
Louis Kahn's Yale University Art Gallery (1953), which pioneered open floor retail concepts