A characteristic of basalt is to discolour to white; this can be used as a graphic element in the design.

Working the stone is done almost solely with one tool, the chisel, a tool that originally was only used for the rough trimming of the rock. When the chisel hits the stone, its outer crystals will be crushed, leaving a white line. The line will be positioned in such a way that it functions as a graphic element for the entire composition. The cuts with a diamond-disc follow the same principle, they are being set with deliberation so that their angles form a three-dimensional drawing, a stone-drawing.