From Lines

One of the simplest, and the most manual, way to make the Pattern is to draw the edges of the Pattern as Rhino lines. Each edge of the Pattern should be an individual line; all lines should be broken at all line intersections. In other words, these lines may not be overlapping.

The input set of lines must consist of closed loops of lines representing the faces of the Pattern. If there are closed loops of lines, a Pattern will be generated and all lines that do not form a closed loop, such as the "leaf" edges will be omitted.