 It turns out, as Edmund Gettier showed, that there are cases of JTB that are not cases of knowledge. JTB, therefore, is not sufficient for knowledge. Cases like that—known as Gettier  cases[17]—arise  because neither the possession of adequate evidence, nor origination in reliable faculties, nor the conjunction of these conditions, is sufficient for ensuring that a belief is not true merely because of luck. Consider the well-known case of barn-facades: Henry drives through a rural area in which what appear to be barns are, with the exception of just one, mere barn facades. From the road Henry is driving on, these facades look exactly like real barns. Henry happens to be looking at the one and only real barn in the area and believes that there’s a barn over there. So Henry’s belief is true, and furthermore his visual experience makes it reasonable, from his point of view, to hold that belief. Finally, his belief originates in a reliable cognitive process: normal vision of ordinary, recognizable objects in good lighting. Yet Henry’s belief is true in this case merely because of luck: had Henry noticed one of the barn-facades instead, his belief would have been false. There is, therefore, broad agreement among epistemologists that Henry’s belief does not qualify as  knowledge.[18] 