Which iconic product packaging, introduced in 1915, was specifically designed to be recognizable even if broken into pieces or felt in the dark?

Throughout history, product packaging has evolved from simple functional containers to powerful brand symbols. Some packaging designs have become so iconic that they're instantly recognizable worldwide and have remained largely unchanged for decades or even centuries. This trivia question explores one of the most significant packaging innovations that revolutionized an entire industry and created an enduring brand identity.

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The Coca-Cola contour bottle
The Toblerone triangular prism
The Pringles cylindrical can
The Absolut Vodka medicine bottle