Turtles all the way down  

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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.
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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.

"Turtles all the way down" is a jocular expression of the infinite regress problem in cosmology posed by the "unmoved mover" paradox. The phrase was popularized by Stephen Hawking in 1988. The "turtle" metaphor in the anecdote represents a popular notion of a "primitive cosmological myth", namely the flat earth supported on the back of a World Turtle.

A comparable metaphor describing the circular cause and consequence for the same problem is the "chicken and egg problem". The same problem in epistemology is known as the Münchhausen trilemma.

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Unless indicated otherwise, the text in this article is either based on Wikipedia article "Turtles all the way down" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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