Chronic kidney disease, also called chronic kidney failure, describes the gradual loss of kidney function. Your kidneys filter wastes and excess fluids from your blood, which are then excreted in your urine.
A cognitive illusion can be defined as the viewer's knowledge and assumptions about the world, or unconscious inferences. There are three categories of cognitive illusions: ambiguous illusions, distorting illusions, and paradox, or fiction, illusions. Ambiguous illusions are images or objects that allow for the viewer to have two valid interpretations of what the object represents or what it actually is. The viewer is usually able to mentally visualize one interpretation right away and eventually the second, after some time.
Besides sensory illusions, there are three types of optical illusions we study: literal, physiological, and cognitive. We have sensory receptors in our brain that detect light, sound, temperature, etc., and most of these receptors are on the surface of our bodies (i.e. eyes, ears, mouth, etc.).