Illusion – A distortion of reality by our senses

illusion [ih-loo-zhuh n]
– something that deceives by producing a false or misleading impression of reality.
– a perception, as of visual stimuli (optical illusion) that represents what is perceived in a way different from the way it is in reality.

An Illusion is a distortion of the senses, revealing how the brain normally organizes and interprets sensory stimulation. Though illusions distort reality, they are generally shared by most people. Illusions may occur with any of the human senses, but visual illusions (optical illusions), are the most well-known and understood. Some illusions are based on general assumptions the brain makes during perception. These assumptions are made using organizational principles, an individual’s capacity for depth perception and motion perception, and perceptual constancy.

The picture is from the Jaisalmer Fort – symmetry ? lines ? steps ? arches ? angles ?  shapes ? which is the near side ? bottom left half or the top right half ?

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