On the Edge is made of two parts of an unfinished octagon. One part has a peg at the middle of one edge. The other part has three holes on one edge into which the peg can be inserted. The piece is of Ash, stained with two coats of clear satin varnish. Assembled, the longest it can be is 127cm, the widest, 19cm, and the thickest, 6cm.