Which architectural feature became the signature element of Apple Store designs that was patented by the company in 2013?

Apple's retail stores revolutionized architectural design in retail spaces, creating a signature aesthetic that many brands have since attempted to emulate. Their innovative approach to store layout, materials, and customer experience has become a case study in architectural branding. Test your knowledge about this iconic retail innovation that merged technology with architectural design to create a distinctive shopping experience.

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The floating glass staircase
The Genius Bar concept
The minimalist wooden display tables
The fully transparent storefront