Which mythological 'product innovation' was specifically designed with customer feedback in mind, created after its inventor heard complaints about the difficulty of ocean navigation?

Throughout mythology and folklore across cultures, gods and magical beings created remarkable artifacts with supernatural powers - essentially the 'product innovations' of ancient tales. These mythological items often represented cutting-edge divine technology that solved problems for heroes or gods. Test your knowledge about these legendary product launches from mythology that have influenced modern storytelling, branding, and product design concepts.

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Poseidon's Trident - Created after sailors complained about unpredictable seas
Thor's Hammer Mjölnir - Designed after gods requested a weapon that would always return to its owner
Hermes' Winged Sandals - Developed when messengers complained about slow travel times
Excalibur - Forged when knights reported difficulty identifying legitimate heirs to the throne