the symphony from the score, and which makes it possible to derive the
symphony from the groove on the gramophone record, and, using the first
rule, to derive the score again. That is what constitutes the inner
similarity between these things which seem to be constructed in such
entirely different ways. And that rule is the law of projection which
projects the symphony into the language of musical notation. It is the rule
for translating this language into the language of gramophone records.


4.015 The possibility of all imagery, of all our pictorial modes of
expression, is contained in the logic of depiction.


4.016 In order to understand the essential nature of a proposition, we
should consider hieroglyphic script, which depicts the facts that it
describes. And alphabetic script developed out of it without losing what
was essential to depiction.


4.02 We can see this from the fact that we understand the sense of a
propositional sign without its having been explained to us.


4.021 A proposition is a picture of reality: for if I understand a
proposition, I know the situation that it represents. And I understand the
proposition without having had its sense explained to me.


4.022 A proposition shows its sense. A proposition shows how things stand
if it is true. And it says that they do so stand.