Which psychological principle did James Dyson specifically leverage when designing his bagless vacuum cleaner with transparent collection chamber?

Product design isn't just about aesthetics—it's about understanding human psychology and behavior. Throughout history, certain product designs have revolutionized industries by tapping into deep psychological principles. This trivia question explores how understanding consumer psychology led to a breakthrough design that changed an entire product category. Test your knowledge about the fascinating intersection of psychology, design thinking, and commercial success!

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The Zeigarnik Effect - showing unfinished tasks creates tension that motivates completion
The Ikea Effect - people value products more when they can see their personal contribution
Visual Confirmation - providing visible evidence of performance to reinforce product value
The Endowment Effect - transparent designs create a sense of ownership before purchase