Which architectural innovation, first prominently featured in Selfridges' London store in 1909, revolutionized retail visual storytelling by allowing customers to see products from outside the building?

The intersection of architecture and retail has transformed how we shop and experience brands. From department stores of the early 1900s to today's experiential flagships, architects have continuously pushed boundaries to create memorable retail environments. This trivia tests your knowledge about a landmark architectural innovation that changed retail visual storytelling forever. Are you familiar with the revolutionary concepts that shaped modern retail spaces?

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Glass curtain wall display windows
Hanging mezzanine galleries
Rooftop shopping gardens
Circular atrium with surrounding balconies