A small collection of things that I find online. All with faces. There is a theory in psychology that is the Theory of Mind: This theory suggests that we have an innate ability to understand and predict the mental states of others. When we see a face, especially if it shows emotions. By observing the facial expressions of another person, or object, we can experience a similar emotional response. This phenomenon, known as emotional contagion, allows us to "feel" what the face we see is feeling and therefore establish an empathic connection.
—
Happy faces make me feel happy. ☻