Art therapy provides a form of expressive therapy that uses art materials, such as paints, chalk, and markers. Art therapy combines traditional psychotherapeutic theories and techniques with an understanding of the psychological aspects of the creative process, especially the affective properties of the different art materials. Art therapists choose materials and interventions appropriate to their clients; needs and design therapeutic sessions to achieve goals and objectives. They use the creative process to help their clients increase insight and judgment, cope better with stress, work through traumatic experiences, increase cognitive abilities, have better relationships with family and friends, and to just be able to enjoy the life-affirming pleasures of the creative experience.