Which architectural innovation, first implemented in 1909, revolutionized retail by allowing customers to see merchandise without assistance from clerks, fundamentally changing store layouts forever?

The architecture of retail spaces has evolved dramatically over the decades, responding to changing consumer behaviors and technological innovations. From traditional storefronts to immersive brand experiences, architects have played a crucial role in shaping how we shop. This trivia question focuses on a pivotal moment in retail architecture history that changed how products were presented to consumers and influenced countless designs that followed.

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The self-service display counter
The glass-enclosed department store atrium
The customer-accessible warehouse format
The exterior display window with night lighting