Which iconic architectural element became so synonymous with a tech brand that it was awarded a trademark in 2013 and is now legally protected as part of the company's retail branding?

The intersection of architecture and branding creates some of the most recognizable structures in the world. Companies invest billions in architectural expression of their brand identity, creating landmarks that serve both functional and marketing purposes. Test your knowledge of how major brands have used signature architectural elements to strengthen their visual identity and market presence.

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Apple's floating glass staircase design
Microsoft's four-color window grid entrance
Google's primary-colored spherical lighting fixtures
Amazon's geodesic biosphere structures