Nearly a century before Mondrian made geometrical red, yellow, and blue lines famous, 19th-century mathematician employed the color scheme for his 1847 edition of Euclid’s Byrne’s idea was to use color to make learning easier and “diffuse permanent knowledge.” The result has been described as . The facsimile of Byrne’s seminal publication is now available in a beautiful new edition. A , it is as remarkable in the boldness of its red, yellow, and blue figures and diagrams as it is in the mathematical precision of its theories. In the simplicity of forms and colors, the pages anticipate the vigor of design. In making complex information at once accessible and aesthetically engaging, this work is a that today define much of our data consumption.