"expression alone is sufficient to create marked changes in the autonomic nervous system. " I'm most intrigued by this idea that a simple movement of our facial muscle actually influence our biological state. Yet overdoing an expression can leave trauma. The fact that if you smile too much, you get a disorder named smile mask disorder if the reason behind your smiles was unnatural, i.e. smiling because your boss told you too. I'm very interested in exploring creating motivations for people to have certain facial expression that leave them with change of their mental state.
From the talk by Joy Buolamwini, The theme of what you do not see can matter more than what you do see is echoed throughout this talk. This is something I definitely did not recognize and was made aware of, and I am very glad that now I know this issue.