 In this case our experience of the constant conjunction of Xs/Ys enables us to draw the inference to Xn, the unobserved cause of Yn. Our experience is of a series of conjunctions (1,2,3) where there is a close resemblance within each species of objects (i.e., among Xs and among Ys). We have direct experience of both kinds of objects (i.e., both Xs and Ys). In the case of the design argument our inference has this form.