摘要
Making objects invisible has never been easy. A seventeenth-century magic spell for growing ＂beans of invisibility＂ instructed that they should be buried with the severed head of a man who committed suicide. For H. G. Wells＇s ＂invisible man＂ in his famous 1897 novel, the process was more scientific, involving the use of mysteri- ous rays related to X-rays that would alter the refractive index of a transparent substance to match that of air.
Making objects invisible has never been easy. A seventeenth-century magic spell for growing ＂beans of invisibility＂ instructed that they should be buried with the severed head of a man who committed suicide. For H. G. Wells＇s ＂invisible man＂ in his famous 1897 novel, the process was more scientific, involving the use of mysteri- ous rays related to X-rays that would alter the refractive index of a transparent substance to match that of air.
