Here is an unusual study of “creating creativity when thinking about something fun with a bitter expression”.
Mind–Body Dissonance: Conflict Between the Senses Expands the Mind ’s Horizons
When subjects recalled a pleasant memory with a bitter expression, they seemed to be able to think about things from a variety of perspectives rather than when they remembered a pleasant memory with a smile.In other words, the subject was able to improve his creativity when he had a face opposite to the feeling of fun.
This is a very interesting research result.When you want to be creative, you can try different facial expressions and actions.