Which architectural innovation was first introduced by Apple in their retail stores that has since been widely adopted across the retail industry?

The intersection of architecture and retail has produced some of the most innovative commercial spaces in modern times. Leading architecture firms have partnered with major retailers to create flagship stores that serve as both functional shopping environments and architectural landmarks. This trivia question focuses on a groundbreaking retail innovation that changed how we think about the relationship between commercial architecture and brand identity.

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The floating glass staircase design by Bohlin Cywinski Jackson
The concept of a 'living room' area for product testing introduced by Foster + Partners
The transparent glass cube entrance designed by Skidmore, Owings & Merrill
The open ceiling with exposed mechanical systems by Renzo Piano