2.223 In order to know whether a picture is true or false we must compare it with reality.
But what does this mean? How do we compare a logical picture with reality? See 4.05. Black says to read Schlick on ‘Facts’ and Hempel’s ‘Remarks’ for discussion of this.
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By picture, Witt means a model of the reality. The model is expressed by prepositions. For example, the preposition 'My pen is on the table" is a picture that is compared to the reality. Is my pen really on the table? or no? This preposition may be true or false, according to the reality. Or it may even be nonsense if I have no pen or if there is no table nearby.
It is important to keep in mind that in order to say that a picture (a proposition) is false or true we must refer to the world/reality. I mean, the names must refer to an object in the world.
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