Benoit Mandelbrot sits for a long interview with filmmaker Errol Morris in 2010, nineteen days before the mathematician's death, and the conversation becomes the spine of this short film. Mandelbrot walks through the path that led him from a childhood spent studying maps and shapes to his discovery of fractal geometry, the mathematics of patterns that repeat at every scale, from coastlines to clouds to the branching of blood vessels. He describes the resistance he faced from a mathematical establishment devoted to smooth, idealized forms, and his own conviction that roughness and irregularity were the more honest description of nature. Morris intercuts the interview with animated fractal imagery, the recursive spirals and self-similar patterns that made Mandelbrot's name synonymous with the field, letting the visuals do the work his equations describe. The film stays close to Mandelbrot's own voice throughout, an old man reflecting on a career spent arguing that the natural world is not made of circles and lines but of something stranger and far more common than anyone had bothered to measure.