Wittgenstein argues in his publication that there is a deep link between language and the world, and logic and language, feeling that language has an underlying logical structure that nobody had yet to discover. The picture theory described by Wittgenstein delves into the idea of representation through pictures, branching out to sculpture and painting too. He argued there was a difference between an image's pictorial form and it's representational form, for example a bicycle has two wheels, and a toy model of a bicycle has four wheels too, however the size of both of these bicycles is different. A real bicycle is a lot larger than a smaller toy model bicycle, and this is what Wittgenstein thought was the representational form. And so, the fact that the pictorial form and representational form differ in size means that a picture taken of a certain object or being cannot express its own pictorial form.
The first proposition in the Tractatus is, "The world is all that is the case" where he is categorizing things and their relationship to one another. One of his main points is that to describe the world you cannot simply look at everything in it, but you can look at the facts and it will be more beneficial. The world is not, in his view made up of objects, but of facts.
"What is the case, the fact, is the existence of atomic facts" is the next proposition made by Wittgenstein, meaning that occurrences in the world are made up of objects interacting logically with one another based on their properties, which are based on the basis of all reality.
The third proposition is where the picture theory comes in, "The logical picture of the facts is the thought" meaning that each each picture is made up of elements that come together to represent something.
"The thought is the significant proposition" He believes that logic itself is what gives the structure of language and what can be said.
"Propositions are truth-functions of elementary propositions (An elementary proposition is a truth-function of itself.)" Referring to 'truth-tables' Wittgenstein had the idea of breaking everything down logically into their atomic parts.
"The general form of truth-function is: [
,
, N(
)].
This is the general form of proposition."This relates to the above point that everything can be broken down and this sort of formula provides a way of formulating language through logic and science, which was what Wittgenstein believed.
The last chapter, "Whereof one cannot speak, thereof one must be silent." looks into the idea or what can and cannot be said in language. The entire Tractatus looks in depth into finding limits to the world's language through logic and science.