When we say complex, we mean to say more hours spent on coloring. Teenagers should be coloring more because it's a basic activity that comes with a host of benefits. Some of the benefits of color by number includes better grip and control, as well as an understanding of boundaries. Other advantages come in the form of therapy and stress relief. Grab a copy now. | Complex Color by Number for Teens by Educando Educando Kids, Paperback | Indigo Chapters