Brown's kleurvisioenen.

(8)textp., 16 handcol. lithogr. plates, orig. clothbacked lithogr. boards, 4to. . = A second Dutch edition of the English book "Spectropia, or surprising spectral illusions showing ghosts everywhere and of colour" (London, 1864), about a specific optical illusion. The reader should stare for about 40 seconds at a coloured illustration. After that, he should look at a blank paper or wall and the illustration reappears in a different colour.