I have a difficult time sewing a straight line, too. After a lot of frustration and giving it a lot of thought, I have realized that we are sitting on a planet that is round. How am I supposed to sew a straight line if the earth I am on is round. Not only is the earth round, but it's hurtling through space and spinning around at the same time. The real question is, how can we maneuver at all with this environment? This is my bubble, and please don't burst it.