Which product design innovation, first widely adopted in the 1930s, revolutionized retail by allowing customers to see products without opening packaging, reducing theft and damage while increasing sales?

Product design has evolved dramatically throughout history, often reflecting broader societal changes and technological advancements. This trivia question focuses on a pivotal innovation in retail product design that fundamentally changed how consumers interact with merchandise. Test your knowledge about how product packaging and design evolved to meet consumer needs and shape shopping behaviors across the 20th century.

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Blister packaging (clear plastic bubble attached to cardboard backing)
Cellophane window packaging (transparent film section in otherwise opaque boxes)
Tamper-evident seals (showing if a package had been previously opened)
Die-cut viewing holes (strategically placed openings in packaging)