Illusion
Much thinner than a traditional applique, Illusion is an illusion: our naive perception of its flow doesn't correspond to physical reality. Well, actually. What you see are different. There is no way to properly categorize illusions, as in many cases there are several underlying mechanisms contributing to an effect. These optical illusions, brain teasers and more. If you create a sound, its volume can range from a whisper to a scream.
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