Which architectural innovation, first widely implemented in retail spaces in the 1930s, fundamentally changed how customers navigate stores by creating a predetermined path through merchandise?

The architecture of retail spaces has evolved dramatically over the decades, with innovative store layouts transforming how consumers interact with products. From the earliest department stores to today's experiential retail environments, architects have played a crucial role in shaping commercial spaces. This trivia question explores a famous architectural innovation that revolutionized the retail experience and continues to influence store design worldwide.

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The Gruen Transfer layout (designed to disorient shoppers)
The IKEA maze (one-way path through all departments)
The Racetrack layout (oval path around central promotional area)
The Grid System (orthogonal aisles organized in a strict pattern)