What was the primary visual element that Instagram retained when it changed its skeuomorphic camera logo to the current colorful gradient design in 2016?

Instagram has become one of the world's most recognizable social media platforms, but its brand identity has evolved significantly since its launch. The app's iconic logo went through a dramatic redesign in 2016 that sparked widespread user reactions across the internet. This poll tests your knowledge about this pivotal moment in social media branding history that changed how we visually recognize one of the most influential platforms in pop culture.

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The rainbow spectrum gradient colors
The square shape with rounded corners
The camera flash in the upper right corner
The brown leather texture details