🚀 go-pugleaf

>In article 24242@access.usask.ca, 
choy@skorpio.usask.ca (I am a terminator.) wrote:
>How do you know that the line you draw is really straight? What
>defines straightness?

and somebody else (sorry, I clipped off the name) replied:
>>
>>This is something I've been wondering about since a long time. Although we can
>>make a circle as precise as we want, I think we cannot make a really
>>precise straight line.               [text deleted for brevity]

And John Baez replied to that:

> The compass is nice because it works straight from the definition of a
> circle, while a ruler, as you note, is not so nice since it does not
> work from the definition of a straight line as the shortest path between
> two points. 

Well, how about drawing a circle using the compass on paper, cutting it
out carefully, and folding it in half?  That will give you a line as 
straight as the circle was round to begin with.  In both cases the limiting
process is your hand/eye coordination and the sharpness of your pencil.

-Bill Gawne  (obviously an experimentalist)