Book excerpt: Invisible Language: Its Incalcuable Significance for Philosophy reveals that although the use of language is visible or audible, the medium employed boasts neither of these attributes. Garth L. Hallet suggests that from Plato until now, the intangibility of language has exercised a far more profound influence in philosophy than even Wittgenstein came close to demonstrating. Indeed, without that pervasive factor of language, the history of philosophy would have been undeniably different. Yet philosophy is, and can legitimately aspire to be, much more than a struggle between language and human comprehension of it. Ultimately, this book suggests that philosophy’s positive possibilities, so often obscured by linguistically-inattentive practice, reach as far as human thought can reach.