Marcus du Sautoy traces the history behind some of science's most recognizable diagrams, treating each one as a piece of storytelling rather than decoration. He walks through the Mandelbrot Set, the fractal named for Benoit Mandelbrot that turns a single equation into an image with infinite detail at every scale, and shows how it became a tool for studying chaotic and dynamic systems. He also takes apart the periodic table, tracing how a nineteenth-century attempt to organize known elements by weight and behavior turned into a working map that could predict elements nobody had found yet. Du Sautoy talks to researchers who still use these diagrams daily and pulls out the design choices that make them work: what gets shown, what gets left out, and why a good diagram can carry an argument that paragraphs of text cannot. The series moves case by case rather than building one continuous argument, so each diagram gets treated as its own small piece of scientific history.