is a derivative work of the following images: File:Spectropia,_or,_Surprising_spectral_illusions.djvu licensed with PD-US 2012-01-02T18:42:48Z Theornamentalist...
illusions pg 1.jpg Spectropia, or, Surprising spectral illusions pg 14a.jpg Spectropia, or, Surprising spectral illusions pg 14b.jpg Spectropia, or,...