 One motivation for including a sensitivity condition in an analysis of knowledge is that there seems to be an intuitive sense in which knowledge requires not merely being correct, but tracking the truth in other possible circumstances. This approach seems to be a plausible diagnosis of what goes wrong in at least some Gettier cases. For example, in Dharmottara’s desert water case, your belief that there is water in a certain location appears to be insensitive to the fact of the water. For if there were no water there, you would have held the same belief on the same grounds—viz., the mirage.