Self-expression and interpersonal sharing of emotion have been shown to strengthen groups. However, how to accomplish such interpersonal sharing in public settings is a challenge. In a pilot study of a prototype system, we sought to facilitate public self-expression and sharing of affective information. We followed five design principles around the concept of art-mediated self-expression and created a collective doodling installation. The pilot trial demonstrated positive results around engagement of end users. As we reflected on the results from this trial, we found implications for building trust and collaboration in teams.