Spectropia ; or, Surprising spectral illusions. Showing ghosts everywhere, and of any colour (1865)
Brown, J. H · London, Griffith and Farran · leaf 13
* This distance can easily be perceived by getting an impression on the retina, according to the Directions,page i, and then, on performing the above experiment, the arterial ramifications and the central spot will be distinctlyperceived to move over the spectral figure. 10 … Fig. 6. Besides the above-mentioned structures, there are others which may play an important partin these illusions, especially the common museas volantes, so called from then- resemblance to flying flies. They consist of cells and filaments, the debris of thestructures of the eye, and float about…
Ghosts · Optical illusions
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