This beautiful coloring book - not only for grown-ups - features more than 50 intricate optical illustions. It is the perfect way to unleash your inner artist and creativity. Perfect for beginning artists Optical Illusions Coloring Book will help you create mind-bending optical illusions to fool your brain and tease your senses. Features: Each Image Is Printed One Sided Various Levels Of Difficulty and Intricacy Great Size: 8.5 x 11 inches Great for All Skill Levels Variety of designs and patterns Makes a great gift Kws: optical illusion, geometric coloring book, optical illusions book for kids, optical ilusions, optical illusions activity book