Which mythological concept has been most widely adapted into tiered retail loyalty programs where customers 'ascend' through different status levels?

Throughout history, mythology and folklore have provided rich symbolism that modern retail brands often leverage in their customer journey design and visual storytelling. From the Phoenix representing brand rebirth to the labyrinth symbolizing customer navigation challenges, mythological elements appear across retail experiences. This trivia question explores how one particular ancient mythological concept has been uniquely adapted into modern retail loyalty programs.

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Norse Valhalla's warrior hierarchy, where fallen warriors earned progressively higher status in the afterlife
Greek Mount Olympus hierarchy, with mortals climbing toward godhood through increasingly divine status levels
Egyptian Book of the Dead's soul weighing, where hearts were measured against a feather to determine afterlife rewards
Celtic Otherworld journeys, where heroes passed through magical trials to reach sacred realms of increasing power