How to square handwriting variation?

[Jorge_Stolfi]

writing upward or leftward strokes with a quill on a surface that is not as flat as paper is a recipe for catastrophe. It's only possible if you are very careful: light upward strokes and thick downward strokes is lesson 1 in calligraphy.

What you write above is totally true, but I believe that most letters of Voynichese were designed to be written with two strokes.  In particular, r, s, and n were meant to be written as (1) a downward i or e stroke, with full pressure, leaving a thick stroke with butt ends; and (2) a plume, traced lightly upwards and counterclockwise, ending in a fine "mousetail" point.  Except that the two strokes of the n could be traced without lifting the pen, so they often became a single stroke with a curve at the bottom, instead of the expected sharp angle.

Many r, s, and n glyphs now look like they were traced in one or two strokes, but with the plume drawn in the opposite direction - downwards and clockwise.  I have an explanation for those cases, but I am not allowed to mention it here...

All the best, --stolfi