My tangle pattern: Fatopyr
Here's some more geometric homework. Circles and diamonds tonight, and some shading to make them 3D. For a variation, look at the detail I took from my 'World Map' drawing where I left some of the tangle unshaded, and transitioned to the 3D. Isn't this a wonderful world? Circles. Diamonds. A dash of darker lines, and just look what you can do!