Which psychological principle did Steve Jobs and Apple's design team primarily leverage when creating the iPhone's revolutionary touchscreen interface that eliminated physical keyboards?

Throughout history, certain product designs have fundamentally changed how we interact with technology by leveraging deep insights about human psychology. The inventors behind these revolutionary designs often conducted extensive research into user behavior and cognitive patterns before creating products that seemed intuitive from the moment they were introduced. This poll tests your knowledge about a pivotal moment in product design history that changed how billions of people interact with technology today.

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The Von Restorff Effect (distinctive items are more likely to be remembered)
Affordance Theory (objects should visually suggest their function and how they can be manipulated)
The Zeigarnik Effect (people remember uncompleted tasks better than completed ones)
The Isolation Effect (items that stand out from their context are better remembered)