In a narrow sense, illusion is a false perception of reality. In a broader sense, false interpretations and judgments are also called illusions. The illusion of the senses produced by technical means is usually called an illusion.  By extension, it also represents a form of illusion formation. If a situation cannot be seen or simulated on a moving or still “real” image, it is nevertheless considered “real” (see accompanying photograph). Painters and draughtsmen use certain visual methods of expression (trompe-l’œil) in order to create an unusual and therefore surprising impression, through which surprises and surprises, even lasting surprises and surprises can be realised. For example, the painter and draughtsman Maurits Cornelis Escher used optical illusions exclusively. Magicians and magicians apply technical skills to the audience present and use these skills to exploit the possibility of psychological deception. Known for this effect is: for example, magician David Copperfield.