Which architectural retail technology innovation was first widely adopted around 2015-2016 that fundamentally changed how physical store layouts are designed?

The fusion of architecture and retail has transformed shopping experiences throughout history. From the grand department stores of the 19th century to today's experiential flagship locations, architectural innovation continues to shape how consumers interact with brands. This trivia question explores a significant technological advancement that revolutionized retail architectural design and customer experiences in the digital age.

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Beacon proximity marketing systems that enabled personalized in-store navigation
Interactive digital mirrors/fitting rooms that visualize products without physical try-on
Ceiling-mounted customer heat mapping systems for optimizing store traffic flow
Robotic inventory management systems that altered traditional stockroom designs