Turtles All the Way Down

The phrase "turtles all the way down" is used by philosophers and writers to depict the issue of infinite regression. The image comes from a myth in which a flat Earth sits on the back of a giant world turtle. That turtle stands on an even bigger turtle, which stands on another, forming an endless column of turtles. Since there is never a final foundation, the story shows how some explanations keep asking for another explanation.

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