Illusions  “Our senses can be trusted , but they can be easily fooled”, affirms the famous ancient Greek philosopher Aristotle.  As living human beings , we are enriched with five senses , sight, smell, hearing, taste, and touch. These  are resources in our bodies  through which we perceive the outside world.  This leads to the question ,What  are illusions?, Illusions are  a contortion of the senses, showing  how the human mind  ordinarily arranges and interprets sensory stimulation. Though illusions distort reality,  they are in common with the vast majority of people .     Most illusions have a tendency to deceive one’s   taste, sight, touch, smell, and sound. while there are a few other illusions “that may distort perception due to changes in internal body structures”(NIH). The three fundamental kinds of illusions  are optical , auditory , and tactile illusions.    Optical illusions  happen when  images are  perceived through the sense of sight and  tend to be deceptive, causing errors in the way you see the image .This relates to the Müller-Lyer illusion. The Müller-Lyer illusion plays with  how one’s brain remembers the world around. In the article “Why your brain thinks these identical lines are different lengths it asserts ” The Müller–Lyer illusion, at left, is a near perfect case of this visual and mental muscle memory”(Klutch). An optical illusion  depends on the procedure through which the brain makes a visual image   in one’s mind utilizing either or both past memories  and how the object currently looks .    The Ebbinghaus illusion also relates to this . In this type of optical illusion the brain is tricked on how it perceives depth. Based on the way we see things in our everyday life , we are used to thinking that the farther the objects the smaller the size , and vice versa. In the article Why does one of these circles look so much smaller than the other,  the author remarks ” Studies have found that people from rural regions are less susceptible to the illusion than city dwellers are” (Klutch). The last are auditory illusions which  mislead one’s  through sounds. These illusions are “impossible sounds”, such as hearing a missing fundamental frequency , or listening to a infinite Glissando, where a musical note increases or decreases  in octave every second . Tactile illusions affect the sense of touch , they are side effects of some psychological disorders, for example ,If a person’s leg was amputated , they would still feel pain on that leg that was removed .      Illusions are real but they make you see things incorrectly. For example the image on the right shows how these vertical  two lines that belong to a part of a building  look like  one that is longer than the other . “But the  vertical lines that form the interior and exterior corners of the room and building are exactly the same length”(Klutch) . Illusions are definitely not fake ,all they do is make us misinterpret a signal, but overall they are real. The reality plus a perception error equals an illusion.Illusions are created when the lens of the eyeball focuses light back onto the retina, where photoreceptive rods and cones are affected by the wavelength of the light. Information about the light entering the eye travels through the optic nerve, where it is then interpreted by the brain and results with the illusion , another component is the use of colors, light and patterns to create images that can be deceptive or misleading to our brains.

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