 Note first that clause (1) on its own does not determine suitably distal content because there is a causal chain leading from C to R and, if the system had been selected for responding to Cs by producing Rs, it must also have been selected for responding to the proximal items (the Prox-Cs) in the causal chain (such as the light reflected from Cs toward the retina of the eye, in the case of visual perception). There is, however, an asymmetry, to which clause (2) appeals. The system was selected for its disposition to respond to the proximal items because by that means it responded to the more distal items, but the system was not selected for responding to the more distal item because by that means it responded to the more proximal items. This is why C, rather than one of the Prox-Cs, qualifies as the content of R.