Life presents us, intimately and immanently, with a series of diverse and puzzling aporia. One event and its interpretation, occurring in the simultaneous context of another and differing event, leads us to reflect on the limits of language in order to adequately negotiate the limits of human experience. The process of perplexity in the face of disjunctive similitudes we may call aporesis. There are many examples of what can henceforth be called aporia_concepts mutually necessary but paradoxical, contradictory expectations of the human condition. The mutual imbrications of nature and culture, the presence of the past in the present, or the contradictions of the modern-self concept are all fundamental examples of aporetic structures. This book attempts, through a series of interpretive discussions, to confront a number of well-known perplexities in their structural form of disjunctive moments, of interpretive contexts of 'this is' and 'this is not.'