Background: Coloring books for adults have become a ubiquitous presence in retail outlets worldwide and in the visual cultural landscape. The goal of this study was to determine differences in outcomes between art therapist-facilitated open studio and individual coloring. Methods: The study used a within-subjects experimental design. Healthy adult participants (aged 19-67 years) were invited to engage in one session each of individual coloring, and open studio facilitated by an art therapist. A total of 36 participants enrolled in the study; 29 completed pre-and post-surveys for both conditions. Outcomes measured included positive and negative affect, perceived stress, self-efficacy, and creative agency. Results: The art therapist-facilitated open studio condition resulted in superior improvements in positive affect, creative agency, and self-efficacy compared to the coloring condition. Both conditions resulted in lowered stress and reduced negative affect. Discussion and implications: The results indicated that coloring might have therapeutic benefits on distress; however, only the art therapist-facilitated open studio session showed significant improvements in self-efficacy, self-perceptions of creativity, and positive mood. Art therapists might consider using the phenomenon of coloring as a doorway to art therapy and more spontaneous creative and self-expression for transformative change. Future studies should seek to identify the unique mechanism of change through which art therapist-facilitated art making explains the shifts in positive affect, creative agency, and self-efficacy. R ESUM E Contexte : Les livres a colorier pour adultes sont d esormais omnipr esents dans les magasins partout dans le monde et dans le paysage culturel visuel. Le but de cette etude etait d' etablir les diff erences entre les r esultats obtenus dans le cadre d'un studio ouvert facilit e par un art-th erapeute et le coloriage individuel. M ethodes : L' etude a eu recours a un devis exp erimental intra-sujets. Des participants adultes en bonne sant e (âg es de 19 a 67 ans) ont et e invit es a participer a une session de coloriage individuel et a un studio ouvert anim e par un art-th erapeute. Au total, 36 personnes se sont inscrites a l' etude ; 29 d'entre elles ont r epondu a un questionnaire avant et apr es l'intervention. Les r esultats mesur es portaient sur les affects positifs et n egatifs, le stress perçu, le sentiment d'efficacit e personnelle et l'agentivit e cr eatrice. R esultats : La situation de studio ouvert anim e par un art-th erapeute a donn e lieu a de plus grandes am eliorations en ce qui concerne les affects positifs, l'agentivit e cr eatrice et le sentiment d'efficacit e personnelle, comparativement a la situation de coloriage. Les deux situations ont entraîn e une diminution du stress et de l'affect n egatif. Discussion et implications : Les r esultats indiquent que le coloriage peut avoir des effets th erapeutiques sur la d etresse ; toutefois, seule la session en studio ouvert anim ee par un artth erapeute a e...