Walter Wick is the photographic illustrator of the I SPY series, and the author/illustrator of the Can You See What I See? series. Together, they have more than forty-five million copies in print and are translated into more than 10 languages. He is also the author and photographer of the award winning A Drop of Water: A Book of Science and Wonder, and Walter Wick’s Optical Tricks, a book of photographic illusions.