Small wood block
Mixed media: Wood carving. Update of earlier post:
You may notice that the line is thinner and somewhat prettier on the spiral side than on the knot side. This is due to a change of carving tool. For the knot I used a knife made for wood carving! Specifically a "V" type knife, the most narrow and sharp one I could find.
For the spiral I used an ordinary (and pretty old) retractable blade knife ("carpet cutter"). This tool proved to be much better.
Below is a photo of the knot side before it was coloured black:
The knot was also made in linoleum: Knot #20.