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The fallacy in the argument is that there is in fact nothing absurd about believing the teapot to be there, if those "ancient books" were written by an ancient astronaut or other being who placed the teapot there.

The fallacy in the argument is that there is in fact nothing absurd about believing the teapot to be there, if those "ancient books" were written by an ancient astronaut or other being who placed the teapot there.

The argument ''presumes'' that such is not the case, so presumes what it sets out to prove, and is thus a circular argument.

The argument ''presumes'' that such is not the case, so presumes what it sets out to prove, and is thus a [[circular argument]].

That is, the argument is based on the ''presumption'' that there is no valid reason, beyond widespread belief, to believe that the teapot exists.

That is, the argument is based on the ''presumption'' that there is no valid reason, beyond widespread belief, to believe that the teapot exists.