One eminent philosopher has given a direct response to this question. Namely, Ludwig Wittgenstein contended that Logic is about the boundaries of reality.

Although it's not necessary, perhaps we should say a little about Wittgenstein's professor and the eminent philosopher Bertrand Russell. According to Russell, logic is the fundamental structure of all language. That all sentences have an underlying structure that followed the rules of logic, such that logic is, perhaps, about the structure of language.

Taking this idea in a much different direction (the early) Wittgenstein argues that logic structures the limits of our thinking. For Wittgenstein our thinking is shaped by our language. That is, when we think of the Cartesian doubting whether anyone else has ever thought, whether he or she is the only one who is really thinking, Wittgenstein denies this altogether. Specifically, the only reason the Cartesian can think is because they have been immersed in a language (This, with the development of Psychology, linguistics, etcetera, has proved dubious). So, in essence, language shapes our thinking, but it also shapes the way we understand reality.

According to Wittgenstein language describes situations or states of affairs. That is, it gives us pictures of reality. If I say, "Tomorrow it will rain," on the early Wittgenstein's view, this is "painting" a picture of reality. What is more, language describes reality, such that it is reality. What we know about reality and how we describe reality is only expressed through language. Thus, when we want to understand reality, we want to know not just what it is at the moment, but how it might be. Here comes the punch line.

Logic tells us the limits on how the world might be or can be. For instance, it's an incontrovertible fact of logic that one thing cannot be in two places at the same time. It is true in all possible worlds that P and not-P is false. Thus, we can use this as a limit on how the world might be. For instance, I cannot be both in Tokyo and not in Tokyo (say in Los Angeles) simultaneously; it cannot be both raining and not raining in the same place at the same time (strictly speaking); and so on. In this sense, logic, according the Wittgenstein tells us what the structure and limits of reality are. Specifically, they form the boundaries of our thinking and language

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Alfred Sidgwick has written: 'Fallacies' -- subject- s -: Logic 'The process of argument' -- subject- s -: Logic 'Distinction and criticism of beliefs' 'The use of words in reasoning' -- subject- s -: Reasoning, Logic 'The application of logic' -- subject- s -: Logic

Pierre Berloquin has written: '100 games of logic' -- subject(s): Problems, exercises, Logic 'Games of logic' -- subject(s): Logic, Puzzles 'Le livre des jeux' -- subject(s): Games '100 Games of Logic' -- subject(s): Logic, Problems, exercises

Henry Bradford Smith has written: 'Symbolic logic' -- subject(s): Logic 'The transition from \\' -- subject(s): Consciousness 'Letters on logic to a young man without a master' -- subject(s): Symbolic and mathematical Logic 'A first book in logic' -- subject(s): Accessible book, Logic

N. O. Losskii has written: 'Value and existence' -- subject(s): The Absolute, Values 'Freedom of will' -- subject(s): Free will and determinism 'L' intuition' -- subject(s): Intuition, Matter, Vitalism 'Sbornik zadach po logike' -- subject(s): Logic 'Dostoevskii i ego khristianskoe miroponimanie' 'An epistemological introduction into logic' -- subject(s): Logic, Theory of Knowledge

Subject centered design model is widely used in the United States. It focuses on the content of the curriculum. The sequence of the lessons follows the logic of the subject matter.

Gregory Dexter Walcott has written: 'An elementary logic' -- subject(s): Logic 'Logic and scientific method' -- subject(s): Logic 'Research and statistics' -- subject(s): Academic Degrees

Ernest W. Adams has written: 'A primer of probability logic' -- subject(s): Probabilities, Algebraic logic 'The logic of conditionals' -- subject(s): Conditionals (Logic), Probabilities, Counterfactuals (Logic) 'Surfaces and Superposition' -- subject(s): Geometry

Daniel A. Bonevac has written: 'Simple logic' -- subject(s): Logic 'The art and science of logic' -- subject(s): Logic 'Worldly Wisdom' 'Introduction to world philosophy' -- subject(s): Introductions, Philosophy

Robert J. Kreyche has written: 'God and reality' -- subject(s): Natural theology 'Logic for undergraduates' -- subject(s): Logic 'Logic for undergraduates' -- subject(s): Logic 'The making of a saint' -- subject(s): Devotional exercises

Patrick J. Hurley has written: 'A concise introduction to logic' -- subject(s): Logic 'A concise introduction to logic' -- subject(s): Logic, Logica, Logique

Christopher John Hogger has written: 'Introduction to logic programming' -- subject(s): Logic programming 'Essentials of logic programming' -- subject(s): Logic programming

Neville Dean has written: 'Logic and language' -- subject(s): Logic programming, Language and logic, Logic 'The essence of discrete mathematics' -- subject(s): Mathematics, Computer science

Georg Kreisel has written: 'Elements of mathematical logic (Model theory)' -- subject(s): Symbolic and mathematical Logic 'Elements of mathematical logic' -- subject(s): Symbolic and mathematical Logic 'Modelltheorie' -- subject(s): Model theory

E. S. Andreeva has written: 'Dialektika teksta' -- subject(s): Language and logic, Logic 'Opyt logiko-lingvisticheskogo sinteza' -- subject(s): Language and logic, Logic

Robert Feys has written: 'Logistiek, geformaliseerde logica' -- subject(s): Logic, Symbolic and mathematical, Symbolic and mathematical Logic 'Modal logics' -- subject(s): Logic, Symbolic and mathematical, Modality (Logic), Symbolic and mathematical Logic

Lionel Ruby has written: 'The art of making sense' -- subject(s): Logic 'Logic and critical thinking' -- subject(s): Logic, Thought and thinking

Hans Rademaker has written: 'Hegels \\' -- subject(s): Logic 'Hegels \\' -- subject(s): Logic

George Englebretsen has written: 'Logical negation' -- subject(s): Negation (Logic) 'Line diagrams for logic' -- subject(s): Logic diagrams 'Bare facts and naked truths' -- subject(s): Truth

Francesco Varvello has written: 'Major logic (epistemology)' -- subject(s): Scholasticism, Theory of Knowledge 'Minor logic' -- subject(s): Logic 'Ethica' -- subject(s): Catholic authors, Christian ethics

Dov M. Gabbay has written: 'Investigations in modal and tense logics with applications to problems in philosophy and linguistics' -- subject(s): Comparative and general Grammar, Modality (Logic), Semantics (Philosophy) 'Handbook of Defeasible Reasoning and Uncertainty Management' 'Labelled deductive systems' -- subject(s): Logic 'Fibring logics' -- subject(s): Symbolic and mathematical Logic 'Temporal logic' -- subject(s): Computer programming, Symbolic and mathematical Logic 'Interpolation and definability' -- subject(s): Definability theory (Mathematical logic), Interpolation, Modality (Logic)

Jane Seabrook has written: 'Furry logic parenthood' -- subject(s): Parenthood, Quotations, maxims, Humor 'Purry logic' 'Furry Logic 2007 Calendar' 'Purry logic' -- subject(s): Cats, Humor, Pictorial works 'Furry Logic Laugh at Life' 'The Pick of Furry Logic' -- subject(s): Humor, Conduct of life, Animals, Pictorial works

David Lawrence Fairchild has written: 'Logic' -- subject(s): Logic, Symbolic and mathematical Logic

Joseph T. Clark has written: 'Conventional logic and modern logic' -- subject(s): History, Logic

Robert A. Magnuson has written: 'Symbolic logic retrieval users code' -- subject(s): Data processing, Logic, Symbolic and mathematical, Medical records, Symbolic and mathematical Logic 'Symbolic logic retrieval users guide' -- subject(s): Data processing, Logic, Symbolic and mathematical, Medical records, Symbolic and mathematical Logic

Patrick Shaw has written: 'Logic and its limits' -- subject(s): Logic