Coloring also takes us back to a time when everything was easier. You agree that such activity would seem more suitable for kids than for adults. In fact, painting is associated by most people with the period when they did not have much to do, and carelessness was more than enough. In order to take a little dip into childhood and clear the emotional background, coloring is an ideal option. It seems to take us out of the current stress state and allows forgetting about everything for a few hours.
Try to use a themed coloring. For example, a series of coloring books about animals, buildings or machines give children an idea of the objects of the world. Coloring of fairy tales or cartoon characters, are good because they allow the child to "talk" with their favorite characters and express their attitude towards them through colors.