I’ve always liked the aesthetics of the pilchrow. (The look of the section sign also appeals.) Until Wikipedia informed me of the correct name, I’d tended to call it the “Paragraph mark”. What I hadn’t realised, but what the good folks of Wikipedia tell me, is that it is derived not from the letter P but from the letter C.
It seems so natural to us to divide words and ideas with white space, that it seems incredible that anyone ever did anything else. I wonder if the obsolescence of typographical marks is related to the cost of writing materials?