The Ladder, The Fly-Bottle, Proposal

Wittgenstein's comment, in #291 of the Investigations, "What we call 'descriptions' are instruments for particular uses", suggests not that he repudiates his Tractatus concept of Language as a 'picture of the World', but that he now recognizes that function as one among a plurality of uses.  That may be why his image of his effort in the Tractatus--leading somewhat up an eventually disposable ladder, from #6.54 of that work--is similar to its correlate in the Investigations, at #309--"To show the fly the way out of the fly-bottle": common to the two is a procedure that can guide a reader to a kind of liberation.  In other words, both works are prescriptive, and, hence, are constituted by Proposals, not by Propositions, with the main difference that by the later project, he recognizes his procedures as such, with the result a re-conceiving of Language that accommodates that reflective insight.  So, ultimately, his divergence from his apparent earlier Logicism is based on a difference in what the term 'Language' denotes, not connotes--the example of his own writings vs. the contrivances of his erstwhile fellow Logicists.