Which architectural innovation, first widely implemented in department stores during the 1880s-1890s, revolutionized retail design by allowing for more open floor plans and better visibility of merchandise?

Department stores transformed urban architecture in the late 19th century, introducing revolutionary retail concepts that still influence modern commercial design. These architectural marvels weren't just shopping venues but social destinations that forever changed how we experience retail spaces. Test your knowledge about this pivotal moment in architectural and retail history!

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Steel-frame construction with column-free floors
Baroque-inspired decorative facades
Underground shopping tunnels
Rotating display platforms