In formal terms, a Sligo chair can be described as a plank or board chair, in that most of the elements are considerably wider than they are thick: the proportions of the members are those of a plank—wide and relatively thin—in contrast to a 'stick' whose cross-section is approximately square (or round). It has a distinctive triangular seat, consisting of a side-to-side front element [fig. 2] (A), a front-to-back central element (B) and two side elements (C), forming a triangle. The single back leg (D) continues up past seat height to form the backrest. The front legs (E) are 'sticks' that attach to the front element.