Page "Epistemology" Paragraph 36

Reliabilism has been challenged by Gettier cases.

Another argument that challenges reliabilism, like the Gettier cases ( although it was not presented in the same short article as the Gettier cases ), is the case of Henry and the barn façades.

In the thought experiment, a man, Henry, is driving along and sees a number of buildings that resemble barns.

Based on his perception of one of these, he concludes that he has just seen barns.

While he has seen one, and the perception he based his belief that the one he saw was of a real barn, all the other barn-like buildings he saw were façades.

Theoretically, Henry doesn't know that he has seen a barn, despite both his belief that he has seen one being true and his belief being formed on the basis of a reliable process ( i. e. his vision ), since he only acquired his true belief by accident.