My father used to yell at me to keep the lines straight and overlap the same amount on each pass. When I bought my first house, it was a corner lot. I used to cut it straight and perfect every time, then I decided to start in the middle, cut the wheels to one side, and go in a swirl. Afterwards my neighbor asked me if everything was ok, and I told him that I wanted to do something different. I also liked cutting diagonal with a wave pattern to break things up a bit. The yard looks good, but those straight lines make me thing of those days as a kid pushing a mower and having someone screaming at me.