 Sensitive knowledge of the corresponding objects, however, could never have this degree of certainty, and because our knowledge derives from our knowledge of objects it would seem that scientific knowledge of space is of a different kind from our knowledge of geometry. Thus, for Locke, Euclidean geometry provided one kind of knowledge, and experience and scientific experiment, another. Indeed, one might say that an epistemological gap remains to this day in philosophy in the form of a distinction between empirical and a priori knowledge that is still widely recognised.