Delos and Adelos stands out not only for its captivating narrative but also for its ability to challenge the reader to reconsider their perceptions of reality. The intersection of mythology, philosophy, and mathematics creates a stimulating dialogue that invites reflection on profound existential questions, such as the loss of humanity's centrality in a cosmos dominated by Technology and the relationship between Truth and Time. Despite its complexities, this book offers a valuable opportunity for those wishing to explore the boundary between abstract thought and creative storytelling, serving as a bridge between analytical and existential philosophy. Its uniqueness lies in uniting seemingly distant fields, often in conflict, to provide an inspiring and thought-provoking reading experience. It is a recommended choice for those seeking a literary journey that transcends mere entertainment.The book begins as an exploration of the intertwined fates of Delos and Adelos, two mythical islands symbolizing light and darkness, certainty and uncertainty. Through the experiences of Ione, the protagonist, the story unfolds into a journey that transcends time. While Ione is an ancient wanderer, his reflections on Technology and Science, which dominate the postmodern world, make him a bridge between antiquity and modernity. In an age where humanity is often alienated by the very technical creations it was meant to control, Ione symbolizes the quest for balance between certain knowledge and the irreducible uncertainty that shrouds existence. His character reflects the condition of contemporary humanity, immersed in a fragmented reality dominated by existential anxieties tied to Technology and its power, yet also capable of grasping the necessity of a path without a definitive goal, where common sense and knowledge intertwine and relate.Through a blend of mythology, philosophy, and mathematics, the narrative delves into the profound meanings of these concepts and their relevance to human experience, addressing topics such as empirical numbers, the propagation of errors in a new light, and the Pythagorean Theorem, deconstructed and reconstructed with fresh perspectives. Ione’s reflections touch on philosophical aspects like the myopia and presbyopia of the human mind, the constant search for principles of maximum and minimum in one’s decisions and actions, and the pursuit of God through mathematics.The exposition combines a mythological-philosophical episodic narrative with a mathematical discussion characterized by explanations that are less constrained by logical formalism or rigorous mathematical notation, making them more accessible and conceptually oriented. While it is possible to skip, partially or entirely, the mathematical sections if perceived as too challenging, it is strongly recommended to follow the episodic narrative, which plays a central role in the overall framework.Throughout the narrative, the work also explores Heideggerian concepts of da-sein and mit-sein, the search for the meaning of time, and how contemporary humanity engages with Truth and with a mathematical reality that compels us to redefine our relationship with the cosmos. Within this context, Euclidean and Riemannian spaces and the new Calculus open up fascinating new scenarios.This exposition will not provide formal mathematical proofs. Such developments, which require specific technical expertise, are left to those who wish to delve deeper. The author’s intent is to focus on conceptual aspects, making the themes accessible without delving into the rigorous formalities of calculation, while acknowledging the many directions for investigation that arise in both theoretical and empirical dimensions.The essence of the narrative is binomial, reflecting the reality represented by the union of Delos and Adelos, the chapters alternate between a philosophical discussion and a mathematical one. This binomial nature is not a simple dichotomy but a cosmic dance of complementary forces. Just as musical harmony arises from the interplay of different notes, reality emerges from the union of Delos and Adelos. Phronesis (Φρόνησις, practical wisdom) does not lie in choosing between Delos and Adelos but in recognizing their inseparability. Like a weaver intertwining threads of various colours to create a tapestry, we must learn to integrate these seemingly opposing forces to perceive the true nature of reality.In particular, the construction of empirical numbers will lead us to a reinterpretation of the Pythagorean Theorem, contrasting the classical view of random variables and probability theory. Here, the focus shifts from the general to the particular, opening new avenues of ontological inquiry in a more immediate reality.The approach of empirical numbers introduces a new perspective on uncertainty, considering it as an intrinsic property rather than an external factor. This represents a significant shift in the foundational conception. The aim is not to construct a new paradigm but to expand the existing one, approaching chance from a new perspective—perhaps more symbolic and, therefore, closer to human thought. This methodological shift, focusing on the local propagation of uncertainty rather than the global distribution of probability, brings changes to techniques of analysis and modelling.The philosophical implications of this vision of chance as an ontological necessity rather than mere statistical contingency are profound, influencing how we interpret reality and randomness. This treatment also gives chance a new conceptual status, transcending its traditional role as a tool for statistical and probabilistic investigation.As a final note to this introduction, I wish to emphasize that the book draws inspiration from the roots of Greek thought, a deliberately classical imprint that celebrates the epistemological depth of Western philosophy. Through mythological and philosophical narration, the text explores the connections between clarity and knowledge (Delos) and uncertainty and mystery (Adelos), reflecting the rational and analytical approach that has characterized Western tradition since antiquity.While recognizing the value of Eastern philosophical traditions, such as Advaita Vedanta, which strive to overcome duality and embrace absolute unity, the perspective adopted here underscores a different vision. In contrast to the negation of the distinction between the Self and the external world, this work celebrates the tension between opposites, between Delos and Adelos, as a fundamental condition of human experience.Greek thought, with its focus on critical analysis and understanding the world through reason, emerges as a beacon of balance and wisdom, guiding the path toward more comprehensive and structured knowledge. In this sense, the Western approach reaffirms the importance of a mindset that integrates uncertainty without abandoning logic and reason, celebrating the plurality of forces that shape our existence.