My and my partner made an app where you stare at yourself in the mirror for 5-30 minutes. You'd record how you feel after.

It's not "scientifically proven" to work but it's quantifiable that there's a clear improvement. We tried to scientifically prove it - the scientists were incredibly offended, lol.

So it can't be proven, but there's data. We started quantifying it because corporations asked for data. Nobody wants to buy an app where you record yourself staring at a mirror, so we don't charge for that. We end up charging for the data reporting, anonymization, data handling, etc.

There's some interesting data, like we find people who are highly stressed will get all kinds of diarrhea, vomiting, and angry if they crank it up to 30 minutes. So we designed it to start at 5 min/day for a week, then 10, then 15, slowly up to 30.

Staring at a mirror is a little different to staring at a wall, but I'd imagine the results are similar.