Thinking cap.
Grampy is a character from the Betty Boop cartoons, who likes to invent contraptions out of household items.
He has a thinking cap, which he puts on when he’s trying to solve a problem. The cap is a mortarboard with a lightbulb, which lights up when he has his “Aha!” moment.
I want this cap.
This episode is called Betty Boop and Grampy, produced by Max Fleischer in 1935. It’s good for a giggle:
And relatable (in both this post and in my work), here’s The New Yorker article on the “Aha!” moment (which inspired my reminisce on Grampy), seen through the eyes of their cartoonists.
