Which architectural feature did IKEA introduce in 2002 that revolutionized their store layout and significantly increased customer time spent in stores?

The intersection of architecture and retail has created some of the most recognizable brand experiences worldwide. IKEA's approach to store design has revolutionized how customers interact with products and has influenced architectural thinking about retail spaces. This trivia question explores how IKEA's distinctive architectural strategy has evolved to enhance their customer experience and strengthen their brand identity in the competitive home furnishing market.

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The one-way customer flow path (the IKEA maze)
The central atrium marketplace concept
The integrated restaurant positioned mid-shopping journey
The warehouse self-service pickup area