Long uses both lines and circles in his work, as they are ancient, primitive signs (as in Stonehenge, for example), and have the same simplicity and grandeur as the landscape itself. The circle is a universal symbol of perfection and the infinite, since it has no beginning and no end. This work is named after the Macduff slate of which it is made. Although the pieces of slate that make up the work are irregular in size, the overall shape of the sculpture is circular and there is a careful balance between smaller and larger pieces. The work can be found in the grounds of the Scottish National Gallery of Modern Art (Modern Two), in a position specially chosen by the artist.