Abstract
THE BASIC form of the Hunterston Brooch can be constructed by an elementary compass-and straight-edge method, which this paper will illustrate. Moreover, its form embodies a harmony of disciplined proportion which I believe can be grasped only through the geometrical properties of the form as constructed. This brooch shares principles of design with the Tara Brooch, as well as with manuscript illuminations and sculptured crosses of early Insular Christianity; it even shares its governing ratio with the Tara Brooch.