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The pigment-producing cells that contribute to the yellow spots of some sub-species are called xanthophores. [30] It appears that the fully-black phenotypes do not ever develop these xanthophores. [31] Alpine salamanders produce a toxin from their skin, and both fully melanistic, black salamanders and spotted individuals produce the compound. [32]
An example of the scintillating grid illusion. Dark dots seem to appear and disappear at intersections. The scintillating grid illusion is an optical illusion, discovered by E. and B. Lingelbach and M. Schrauf in 1994. [2] It is often considered a variation of the Hermann grid illusion but possesses different properties. [2] [3]
In 1973, M. J. D. White, then at the end of a long career investigating karyotypes, gave an interesting summary of the distribution of chromosome polymorphism. "It is extremely difficult to get an adequate idea as to what fraction of the species of eukaryote organisms actually are polymorphic for structural rearrangements of the chromosomes.
dream interpretation; dream questions: by dreaming; dririmancy/driromancy / ˈ d r ɪər ɪ m æ n s i /: by dripping blood [10] (alteration of drimimancy, influenced by Middle English drir, ' blood '). Compare hemotomancy. drimimancy/drymimancy / ˈ d r ɪ m ɪ m æ n s i /: by bodily fluids (Greek drimus, ' pungent ' + manteía, ' prophecy ')
A trompe-l'œil body painting by Joanne Gair. The dress: An optical illusion resulting from the brain's attempt to discount coloured tinting from daylight and other sources. [1] The dress was a viral phenomenon, which was either seen as blue and black or as white and gold. Its true colours were eventually confirmed to be blue and black. [2]
Isolation tank – Pitch-black, light-proof, soundproof environment heated to the same temperature as the skin; Prisoner's cinema – Visual phenomenon involving seeing animated lights in the darkness; Scintillating scotoma – Visual aura associated with migraine; Photopsia – Presence of perceived flashes of light in one's field of vision
Visual snow: dynamic, continuous, tiny dots observed across the entire visual field at any time of the day, regardless of lighting conditions, persisting for more than three months. The dots are usually black/gray on a white background and gray/white on a black background; however, they can also be transparent, white flashing, or colored.
A pattern of black dots is located on either side of the dorsal fin mimicking the pattern of the sandy and rocky substrates it dwells among to hide from predatory fishes looking down from above. The back is dark beige in color while the head is silver-beige. The body's color is dull brown and the belly is a lighter shade of brown. The brown ...