The paper applies an interdisciplinary perspective to a fictional text showing that fractals as mathematical models are a powerful tool for conceptualizing life experience in biographical narratives. The multilevel construction of Chatterton by Peter Ackroyd is explored on the basis of fractal metaphor theory. This research focuses on the LIFE IS A STORY conceptual fractal metaphor which is built up on analogical mappings, mental space connections, and blends. The fractal model of metaphor in biographical narrative, which is assigned to the formula LIFE IS A STORY f (1) + f (2) + f (3) + … + f (n), contains the mental space of the intentional source domain story, which provides a way to structure the understanding of the limiting target domain of the concept life. Fractal metaphors aim at making the conceptual metaphor flexible and dynamic, renewing its ability of self-development and self-perfection, transforming itself into one of the means of changeable conceptualization of reality.