Book excerpt: From impossible shapes to three-dimensional sketches and trick art, you won't believe your eyes as you learn to draw optical illusions in graphite and colored pencil. Perfect for beginning artists, The Art of Drawing Optical Illusions begins with a basic introduction to optical illusions and how they work. Jonathan Stephen Harris then guides you step-by-step in creating mind-blowing pencil drawings, starting with basic optical illusions and progressing to more difficult two- and three-dimensional trick art. Perspective and dimension are difficult to capture for both beginning and established artists, but now you can hone those skills in the most unique way possible, while also exercising your mind with these brain-boosting, unbelievable tricks!