Another product Berk created is called Smile Mirror. One cancer survivor Berk interviewed told him that in the first days since her initial diagnosis, “it was weird to look at myself and acknowledge that I had cancer in my body.” These words inspired Berk to create a playful mirror that allows you see yourself...only when you smile.
Making a facial expression, such as a smile, can produce effects on the body that are similar to those that result from the actual emotion, such as happiness. (Kleinke, C.L., Peterson, T.R, 1998). The facial feedback hypothesis posits that our facial expressions affect how we feel. Indeed, if we flex our facial muscles to smile, our brains think that something good happened, results in us feeling happiness.