Take your time and put your artistic ability to a conclusive test by taking on the expert level coloring book. It comes with 22 pages of hand drawn illustrations for you to use your color in, the difficulty level rises depending on how you approach each page. Often regarded as an impossible coloring book, the “Between the lines” book would really put your patience at test. It is going to test your skills whether you use it as a way to get your creativity flowing or a way to pass time on a long flight. As soon as you open this book, you would realize that it requires immense amount concentration to not end up ruining the pages.