This awesome tangle, Irradial, created by Thomas Padros is the focus tangle for this week in couple of Facebook groups! For my first attempt, I just wanted to keep it fairly simply so my string is just a bunch of triangles. I tried to vary the centers of each one somewhat by rotating the starting point, or making it closer to one edge than another.
The shading and highlighting is subtle, but it still adds a lot of dimension and shape to each section.
Zentangle drawn on Strathmore Vellum Bristol using a black, Micron pen. Shading done with graphite pencil. Highlights created with white charcoal pencil.