Which invention's original branding featured a distinctive blue color to intentionally contrast with the predominant red used by competitors, establishing a psychological market differentiation?

Throughout history, groundbreaking inventions have often been accompanied by carefully crafted brand identities. Color psychology has played a crucial role in how these innovations were perceived and adopted by the public. This poll explores how certain color schemes became synonymous with revolutionary products that changed our world. Test your knowledge about the strategic color choices that helped define some of history's most important inventions and discoveries.

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The Polaroid instant camera (1948)
The IBM Personal Computer (1981)
The Sony Walkman (1979)
The Motorola DynaTAC mobile phone (1983)