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The Bad Axe Massacre was a massacre of Sauk (Sac) and Meskwaki (Fox) Native Americans by United States Army regulars and militia that occurred on August 1–2, 1832. This final scene of the Black Hawk War took place near present-day Victory, Wisconsin, in the United States. It marked the end of the war between white settlers and militia in ...
The top and bottom images produce a dent or projection depending on whether viewed with cross- () or wall- () eyed vergence. An autostereogram is a two-dimensional (2D) image that can create the optical illusion of a three-dimensional (3D) scene. Autostereograms use only one image to accomplish the effect while normal stereograms require two.
Visual snow syndrome (VSS) is an uncommon neurological condition in which the primary symptom is that affected individuals see persistent flickering white, black, transparent, or colored dots across the whole visual field. [7] [4] Other common symptoms are palinopsia, enhanced entoptic phenomena, photophobia, and tension headaches.
Closed-eye hallucination. Closed-eye hallucinations and closed-eye visualizations (CEV) are hallucinations that occur when one's eyes are closed or when one is in a darkened room. They should not be confused with phosphenes, perceived light and shapes when pressure is applied to the eye's retina, or some other non-visual external cause ...
The Battle Axe culture is mostly known for its burials. Around 250 Battle Axe burials have been found in Sweden. They are quite different from those found in the Single Grave culture of Denmark. [2] In the Battle Axe culture, the deceased were usually placed in a single flat grave with no barrow. Graves were typically oriented north-south, with ...
Cone cells or cones are photoreceptor cells in the retinas of vertebrates' eyes. They respond differently to light of different wavelengths, and the combination of their responses is responsible for color vision. Cones function best in relatively bright light, called the photopic region, as opposed to rod cells, which work better in dim light ...
Colorless, green, and red photographic filters as imaged by camera. Color vision, a feature of visual perception, is an ability to perceive differences between light composed of different frequencies independently of light intensity. Color perception is a part of the larger visual system and is mediated by a complex process between neurons that ...
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