The fabled oasis in the desert mirage is just one example of the strange things that can happen when light hits the air in certain atmospheric conditions. This captivating volume takes a closer look at mirages and similar phenomena, explaining to elementary readers that there is much more to these natural optical illusions than meets the eye. Topics covered include refraction, the difference between superior and inferior mirages, green flashes, and the famous Fata Morgana castle in the sky mirage. Vocabulary boxes identify key terms, while Think About It and Compare and Contrast questions prompt critical thinking about optics and light.