Gretta chose charcoal. Both additive and reductive techniques were employed to capture the peaks and valleys of the driftwood. This medium and drawing method are particularly well suited to rendering the fluid nature of the form.
In contrast, Martin chose graphite to draw his piece of driftwood. His drawing has a very different presence than Gretta's. The contrasts in tonality and texture are crisp and clean. Each area is locked into its place and isolated rather than one flowing into the other.