"We picture facts to ourselves." (2.1)

This quotation introduces Wittgenstein's picture theory of propositions. According to this view, propositions can represent reality by making a logical picture of the facts they represent. If something is to be considered a picture of something else, the picture and the thing depicted must share something, a form, in common. According to Wittgenstein, propositions and the world share a common logical form. Accordingly, a proposition has the same logical form as the fact it represents. Though the words in a proposition do not in any way resemble facts in the world, their common logical form makes it possible for us to recognize one as a picture of the other.

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