Draft lines, angles, and perfect circles with this versatile tool that celebrates the “golden ratio" and fits in your back pocket. Studied since ancient times and an inspiration to everyone from Leonardo da Vinci to Le Corbusier, the golden ratio is a harmonious geometric relationship of elegant beauty, found everywhere from classical columns to Nautilus shell spirals. The tool is crafted from sturdy brass, and makes a nicely Euclidean gift for designers, doodlers, and lovers of shiny things. Designed in Brooklyn by Christina Sicoli. Made in Canada.