Wordplay: The Philosophy, Art, and Science of Ambgirams : In this book John Langdon shows us how we can expand our understanding of terms and concepts by looking at ambigrams - words designed to be read upside-down, back to front, or in a mirror as well as from left to right. He not only presents the reader with a number of strikingly beautiful and arresting ambigrams but also shows how the very shape of the letters can change our idea of a word and its meaning. He even disarmingly demonstrates how one goes about making an ambigram. But be warned: it's not as easy as it looks. Wordplay is ultimate collection for all those who just can't get enough of the intriguing symbols in Dan Brown's bestselling novels.