Which architectural innovation, first widely implemented in retail during the 1930s, revolutionized customer engagement by allowing shoppers to interact directly with products without staff assistance?

In the intersection of architecture and retail, physical spaces have evolved dramatically to enhance customer engagement. Architects now design retail environments that go beyond mere functionality to create memorable experiences. This poll tests your knowledge about a significant architectural innovation that transformed how customers interact with retail spaces, fundamentally changing the shopping experience in many major stores.

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Self-service store layout with open shelving
Glass-fronted display windows with mannequins
Circular 'racetrack' floor plans
Multi-level atrium designs with escalators