The Joker
The Joker's existence spans approximately 85 years of continuous publication and adaptation. Various interpretations have kept the character culturally relevant across dramatically shifting social contexts. His philosophical flexibility allows reinterpretation for each generation, from campy 1960s television villain to gritty 21st-century psychological study.
Yet the character remains fundamentally dependent upon human civilisation's continued existence. Without audiences, publishers, and cultural infrastructure, the Joker ceases to exist in any meaningful sense. His longevity, whilst impressive by entertainment standards, remains cosmically insignificant.
Volcano
Volcanoes predate not merely human civilisation but terrestrial life itself. The oldest identified volcanic rocks on Earth date to approximately 3.5 billion years, whilst volcanic activity likely commenced during planetary formation 4.5 billion years ago. Volcanoes will continue erupting long after humanity's extinction, indifferent to our cultural productions.
The Hawaiian Islands represent an ongoing volcanic construction project spanning 70 million years. Mount Etna has erupted continuously for approximately 500,000 years. These timescales render human achievements effectively instantaneous.