By combining offline coloring and augmented reality technology, color content (characters) can be applied to virtual environments in real time to express colors, create fun and interest, and interact with user touch on offline screens to maximize imagination and curiosity. 
Coloring not only children but also adults and older people has proven to be a great help in emotional stability and stress relief. In particular, Drexel University in the U.S. published a study that lowered cortisol levels, the main culprit of fatigue and chronic diseases.