Which psychological breakthrough in packaging design, discovered in the 1940s but widely implemented in the 1950s, dramatically increased product usage by making consumption visible to consumers?

In the world of product design, packaging isn't just a container—it's a powerful psychological tool. Some packaging innovations have revolutionized consumer behavior and created entirely new market categories. This poll explores a fascinating breakthrough in packaging psychology that changed how consumers interact with products. Test your knowledge about this influential discovery in consumer psychology!

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Clear packaging windows that allowed consumers to see product quality before purchase
Transparent containers that showed how much product remained, creating a visual cue to use more
Color-changing indicators that signaled when products were fresh or expired
Ergonomic grip designs that created muscle memory and habitual product usage