3D Illusion One Color Coloring Book

This is a unique single-color coloring book that will transport you to mesmerizing depth effects and a stress-relieving experience. Use only one dark color to enhance the contrast and the color in the closed-line contours. You will get a stunning 3D effect with every picture. All designs are printed in square format, so you can slip it into your backpack during travels or easily carry it during your daily commute.