These drawings relate to plane symmetry or wallpaper groups, but they differ in some ways that disqualify them from the mathematical form. Like plane symmetry groups, they start with a two-dimensional pattern. There are translations, rotations, and reflections. The drawings differ from the mathematical form in that I use several unit patterns which are randomly selected. The patterns are isosceles triangles arranged radially in tracks around a center point, forming a polar grid with triangular cells.
