Erratic Turtle Graphics

A gewgaw that I prototyped in 2018 sometime I think. I don't remember when I had the original idea, but I think it was not long before that.

And that idea is: turtle graphics, except there's a small margin of error. You might ask for "Turn right 90 degrees" but you might get only "Turn right 89.91 degrees".

If you use a faint pen, and repeat the drawing instructions many times over, you get a nice pencilly noisy effect.