Grids are a common way to start a Zentangle pattern. The grid can be done in many ways; big, small, perfect or wonky. This grid was done in a way that enhances the globular effect. I added a simple tangle because I knew the spaces in the outer areas were tiny so a simple tangle would be better for those areas. But I wanted to try something else so I worked in the Yin Yang symbol and tangled in the negative spaces for the darker side.
Tangles were done with a brown Micron pen. Shading was done with a terra cotta colored pencil and highlights were done with a white chalk pencil.