A moment of Zen, courtesy of analytic philosophy:
"It might still be said, however, that the dependence of cow thoughts on distal cows is assymetrically dependent on their dependence on disjunctions of proximal cow projections; distal cows wouldn't evoke COW tokens but that they project proximal whiffs or glimpses or snaps or crackles or . . . well, or what? Since, after all, cow spotting can be mediated by theory to any extent you like, the barest whiff or glimpse of cow can do the job for an observer who is suitably attuned. Less, indeed, than a whiff or glimpse; a mere ripple of cow-infested waters may suffice to turn the trick."
(Jerry Fodor, "A Theory of Content, II: The Theory," in Stich & Warfield's Mental Representations)