I have only a clothesline, the rules were not taught to me, but being a bit OCD I have to hang like things together.
Mine is a single line so tall things go at the ends as they might hit the ground in the middle.
It's always a nice day when I do the wash, and as i hang the things out in the sunshine, and listen to the birds singing, I think,,,I would miss all this if I had a dryer. Plus my electric bills would be sky-high!