Which architectural design element, first prominently used in Selfridges' London store in 1909, revolutionized retail by creating a centralized experience and is now standard in department stores worldwide?

The architectural design of retail spaces has evolved dramatically to enhance customer experience and brand positioning. From department stores of the early 20th century to today's immersive brand temples, architects have played a crucial role in translating retail strategies into physical spaces. Test your knowledge about a famous architectural innovation that revolutionized retail design and customer flow patterns.

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The atrium concept with central light well
Exterior glass display windows
Escalator systems between floors
Open floor plan without interior walls