Spectropia, or, surprising spectral illusions showing ghosts everywhere and of any colour is an optical illusion book by J. H. Brown, first published in 1864. == Publication == Initial printings of Spectropia were made in New York City by James G. Gregory, and in London by Griffith and Farran.
Spectropia, or, surprising spectral illusions showing ghosts everywhere and of any colour is an optical illusion book by J. H. Brown, first published in 1864. == Publication == Initial printings of Spectropia were made in New York City by James G. Gregory, and in London by Griffith and Farran.
Source: Wikipedia "Spectropia" · CC BY-SA 4.0
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