How would you achieve invisibility? If you could become invisible, what would you do? What challenges would you face? These are perennially fascinating questions, raising moral dilemmas and prompting scientific investigations as well as inspiring many myths and legends about magic rings and cloaks of invisibility. This wide-ranging cultural history of the concept of invisibility embraces Plato and HG Wells, medieval occultism and quantum theory, zebras' stripes and the optical camouflage used on military ships.