Adult Coloring Books: Mandala for a stress relieving experience (mandalas, stress relief, reduce stress, coloring books, relax) Paperback – September 19, 2016 by Pegasus Coloring Book (Author) MANDALA COLORING FOR ADULTS | Amazing Mandalas This beautiful Mandala Coloring Book will offer you countless hours of relaxation. Mandala means “circle” and “center” in the ancient…