Adult coloring book in relieving Stress

I'm not a big fan of art from before until I've seen this coloring book in the bookstore and did try if I got some hidden talent about it, by surprise its not just developing you skills in art by coloring its different variety. It also bring relief with stress and brings calmness towards your mind and body, now I'm collecting different sets of coloring book like mandala, secret garden, atlantica, arkitectura and many other more.