I'm watching the movie "Mary Poppins Returns".
At one point Marry Poppins sings:
Too much glee leaves rings around the brain
I'm not quite sure what "rings around the brain" means. From context I can imagine it means that too much delight/joy will diminish your logical thinking capabilities and degenerates your intellect. Putting imagination/joy/creativity in contrast to rigorous mathematical thinking. I also assume that the phrase "rings around the brain" comes from the idea that when you are hit on the head you feel rings/stars/birds circle around your head, like in cartoons.
But I'm lost and these are all assumptions that may be the result of too much glee and imagination.