Which architectural innovation, first widely implemented in the 1920s, revolutionized retail customer engagement by allowing shoppers to directly interact with products without assistance from clerks?

In the world of architecture and retail design, certain innovations have dramatically transformed how consumers interact with physical spaces. This trivia question focuses on a pivotal architectural development that revolutionized retail customer engagement by fundamentally changing how products were displayed and accessed. Test your knowledge of how architectural design influences retail strategy and consumer behavior!

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Self-service store layouts with open shelving
Glass-enclosed department store display windows
Multi-level shopping malls with escalators
Automated revolving doors at store entrances