Which groundbreaking 20th century invention's success is partly attributed to its distinctive yellow color, chosen specifically because research showed it was the most visible color to the human eye?

Throughout history, inventors and companies have strategically used color psychology to market breakthrough products. From the vibrant hues of early computing devices to the carefully selected color palettes of modern tech innovations, color choices have played a crucial role in how discoveries are perceived by the public. This trivia question explores a fascinating example of how color science influenced the marketing of a revolutionary invention.

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Post-it Notes (3M)
Sony Walkman
Polaroid OneStep Camera
Motorola DynaTAC (first mobile phone)