Isle of Lanterns
(The), or Lantern-land. An imaginary country inhabited by pretenders to knowledge. In French, Lanternois. (Rabelais Pantagruel, v. 32, 33.)
Lucian has a similar conceit, called the City of Lanterns; and Dean Swift, in his Gulliver's Travels, makes his hero visit Laputa, the empire of quacks, false projectors, and pretenders to science.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894