For me it's the parentheses. I'm sorry, I know it sounds childish, but it's true. Just look at this picture: https://www.semanticscholar.org/paper/The-program

For me it's the parentheses. I'm sorry, I know it sounds childish, but it's true. Just look at this picture: https://www.semanticscholar.org/paper/The-programming-language-LISP%3A-Its-operation-and-Monrad-Krohn/087a4409638c408e09062f313aee04ea1007c394/figure/0 https://www.semanticscholar.org/paper/The-programming-langua... We call that "line noise".