Spectropia ; or, Surprising spectral illusions. Showing ghosts everywhere, and of any colour
A popular-science parlour amusement by J. H. Brown, published in London by Griffith and Farran in 1865, explaining afterimage illusions to general readers who were to stare at each plate and then see a complementary-coloured ghost on a blank wall. The plates are flat, hard-edged figures in single saturated colours — hooded and shrouded spectres, skeletons, pointing arms — plus black-and-white negatives inside stippled oval vignettes, useful as silhouette stock, complementary-colour pairs, and diagrams of the eye.
