If you were like me back in the 80s on a PET you did that and then moved up to more complex randomness with other graphic symbols like the four corner curves or

If you were like me back in the 80s on a PET you did that and then moved up to more complex randomness with other graphic symbols like the four corner curves or bends. I think they had that line in one issue of Creative Computing with a bunch of other character graphic effect snippets.