My ten month old hasn’t yet grasped pointing: “Look over there”, arm outstretched, hand clenched, index finger extended; he looks at the finger rather than anything else.
I’ve always taken this kind of remark (i.e. it and many others like it) as telling against the possibility of a pure demonstrative, of a spoken “This” or of a “That” which successfully picks out an otherwise unknown something, without in so doing imposing preconceptions upon it.
From the logical point of view they would tell against the possibility of a purely designative occurrence of a name—one which in a subject-predicate sentence of the form “S is P” would allow all of the intensional content to reside with the predication.
Here, rehearsing Russell, we might draw the distinction between names as they commonly appear, which may be laden with predicative content—Ivan the Terrible, say—and logically proper names which, being purely designative, may not.