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In the 'barn-facades' thought experiment, Henry drives through a rural area filled with barn facades that look like real barns, but he happens to look at the one and only real barn and forms the belief that there is a barn there. While his belief is justified by his visual experience (according to TK) or by the reliable cognitive process of vision (according to NTK), it is widely agreed by epistemologists that Henry's belief does not qualify as knowledge because it is true merely by luck; had he looked at a facade, he would have formed the same belief.

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