Which architectural innovation did Apple introduce in their retail stores that revolutionized the shopping experience and has since been widely imitated?

The intersection of architecture and retail design has transformed how consumers experience brands. Innovative architectural concepts have become central to the identity and success of major retail companies. This poll tests your knowledge about a groundbreaking retail architectural innovation that changed how we think about shopping spaces. Can you identify the correct architectural innovation that revolutionized a major retail brand's identity?

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The Glass Cube entrance design, first implemented at the Fifth Avenue store in New York
The floating mezzanine level with transparent glass railings
The Genius Bar concept with its distinctive architectural layout
The spiral glass staircase with self-supporting treads