Cyborg spirograph

I've been thinking about something interesting in the drawing space lately. There are various different options for constructing shapes with perfect proportions, I even worked on a demo along those lines myself. However, there's something inherently mechanical and kind of inhuman about these approaches. You can make a square, sure, but all the squares look the same; there's no variation, no nuance.

The only reason you need construction techniques is because of the limitations of the limitations of our hands and our tools. We can't easily draw straight lines or circles freehand because our limbs don't naturally move in straight or circular patterns. We can't really change our hands (yet) but we can change our tools.

What if we made tools that were more assistive in nature? A ruler is perfectly rigid, but what if you had a magnetic pen and put a metallic grid underneath the paper? It wouldn't force you to draw a straight line, but it would mean you naturally move more linearly. That means your lines will still be, broadly speaking, straight lines, but still with some human variation.

A more circular version of this could perhaps be done with a complex arrangement of gears and pulleys that change the fundamental mechanics of your pencil's movement. So you can draw straight lines, but the gears naturally try to pull you into spirals. A perfectly straight line, in this world, would still be kind of circular.

There is of course, the spirograph, which is a rigid version of this, but I think it'd be worth making something with spirograph-like behaviour designed to adjust your drawing rather than control it. A cyborg spirograph.