From the Sketchbook: "Drawing Assignment I"

One of a series of exercises that I assigned to students in a field sketching course that I taught dealt with solving an illustration problem, the paradoxical nature of which leads to thinking that creates interesting new prospects.

Here's the assignment: using only straight lines (freehand or ruled) depict on a sheet of paper a circular shape.

After you have filled a page with possible responses, view a few of the ones I thought of.