Which retail store layout innovation, first widely implemented in the 1930s, revolutionized architectural design by introducing a controlled customer journey through merchandise zones?

The intersection of architecture and retail is constantly evolving. Store layouts have transformed dramatically over the decades, influenced by consumer psychology, technological advancements, and cultural shifts. This poll tests your knowledge about a significant retail layout innovation that changed how architects approach commercial spaces. Can you identify which revolutionary store layout concept fundamentally altered the relationship between product display, customer flow, and architectural design?

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The IKEA maze layout (one-way path through all departments)
The Boutique clustering concept (merchandise grouped by lifestyle rather than category)
The Racetrack/Loop layout (circular main aisle directing customers past all departments)
The Free-flow layout (elimination of fixed aisles for open browsing)