The other thing is that washing should be hung so that things dry quickly (ie, no big overlaps) and so that there are no creases in awkward places (I love washing lines but I really don't like ironing). Most people don't seem to think about this, either.
Whether it's washing that is hung up all higgledy-piggledy, or whether it is perfectly neat, I really enjoy looking at washing lines. And I have discovered that quite a lot of people share my obsession with the matching pegs. Which I find surprising.