Feziii, created by Eni, is a different type of tangle because it is procedural, following specific rules. This is an interesting concept for how to draw a tangle. It was a lot of fun!
Shading Feziii requires some serious thinking because, when it’s used as a fill, there are multiple levels overlapping each other. Fortunately, the video gives you great instructions for handling this kind of tangle.
Zentangle drawn on Strathmore Vellum Bristol using a black, Micron pen. Shading done with graphite and colored pencil.