The Golden Section Finder is a transparent viewfinder available in yellow or blue that is used for observing the golden ratio out in the world.
Perfect proportions observed in nature often follow the theory of the golden section. The golden section is the ratio between the dimensions of natural and geometric forms. Historically, artists, designers and architects have used it as a means of defining beauty in a theoretical rather than intuitive way. Use the Golden Section Finder, a pocket sized gazing device, to locate the proportional perfection in your surroundings.
via swissmiss