Here is the .svg from which that was derived, created in Inkscape, once again using my own custom typeface (which after some recent discussion elsewhere in the forum I think I might try to revisit soon to product a single-line version of, which its already well suited for).
The key bit of this was producing those sets of parallel lines. I wanted to capture something of the organic nature of a person drawing lines by hand, even though I was using a precise mechanical toolset to generate it.
LeWitt’s approach to drawings in this style was to (a) describe the concept of the specific piece of work and then (b) have that concept executed. So there’s the core idea itself – of parallel lines in various directions – and then the draftsman at work, whose lines would inevitably be imprecise, inexact, full of tiny little variances.
A very simple way to approximate that in Inkscape is to use the “clone” menu to create a set of repeats of an object, and use the “random” field in some of the options to introduce noise. So I drew a vertical line, and told it to clone 80 or so more off to the right, and for each of those asked it to vary the spacing by e.g. 10% or so, and to vary the rotation by some random fraction of a degree.
The resulting set of lines are still basically equally spaced and parallel, but with an inconsistency that better suits the hand-executed style of a typical LeWitt drawing than literally evenly cloned lines would.