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Spectropia, or, Surprising spectral illusions : showing ghosts everywhere, and of any colour : with sixteen illustrations (1864)

Filmer, John,engraver, James G. Gregory (Firm),publisher · New York : Published by James G. Gregory, no. 540 Broadway · leaf 30

An illustration from Spectropia, or, Surprising spectral illusions : showing ghosts everywhere, and of any colour : with sixteen illustrations, 1864, leaf 30

Optical illusions · Visual perception · Color vision · Retina · Ghosts

Internet Archive · Yale University, Cushing/Whitney Medical Library · Public domain (published before 1931). Free to use for anything.

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