On the importance of punctuation

I have always remembered an (apocryphal) story from school about an inspector coming into an English class. The inspector noted that the teacher was placing much emphasis on correct punctuation and told the teacher in front of the class that it was more important to get the students express themselves than to learn correct punctuation. Straight away the teacher went up to the blackboard and wrote:

"The teacher says the inspector is a fool."

Just as the inspector was about to get angry with the teacher, the teacher went back to the board and added in some more punctuation, so that it now read:

"The teacher, says the inspector, is a fool."

Anyway the sight of a dragonfly glinting past the window moved me to take the camera out into the garden yesterday. I couldn't find the dragonfly but I took this picture of a butterfly on our Buddlea without knowing what it was

On consulting the internet I found out, much to my surprise that that white mark was not a mistake, it has given the butterfly its name - the Comma


This is what it looks like with its wings open.