Answer:
Within visual perception, an optical illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by a visual percept that arguably appears to differ from reality. Illusions come in a wide variety; their categorization is difficult because the underlying cause is often not clear but a classification proposed by Richard Gregory is useful as an orientation. According to that, there are three main classes: physical, physiological, and cognitive illusions, and in each class there are four kinds: Ambiguities, distortions, paradoxes, and fictions. A classical example for a physical distortion would be the apparent bending of a stick half immerged in water; an example for a physiological paradox is the motion aftereffect (where, despite movement, position remains unchanged). An example for a physiological fiction is an afterimage. Three typical cognitive distortions are the Ponzo, Poggendorff, and Müller-Lyer illusion. Physical illusions are caused by the physical environment, e.g. by the optical properties of water. Physiological illusions arise in the eye or the visual pathway, e.g. from the effects of excessive stimulation of a specific receptor type. Cognitive visual illusions are the result of unconscious inferences and are perhaps those most widely known.
Pathological visual illusions arise from pathological changes in the physiological visual perception mechanisms causing the aforementioned types of illusions; they are discussed e.g. under visual hallucinations.Explanation:
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Answer:
In Tennessee William´s: Streetcar Named Desire:
1. What mood do the opening stage direction and setting description create?
The French quarter in New Orleans, downtown in 1947 introduces the play with the realistic opening stage directed to a poor urban neighborhood setting a blue imbued mood in the audience, emphasized by jazz musical notes played in the "blue piano" that could lead to anxiety.
2. What effect is created with the music of the ""blue piano""?
The effect created by music played on the “blue piano" is people´s emotions related to the sadness coming from loneness and longing.
Explanation:
Set in the French area of New Orleans, where the opening stage of "Streetcar Named Desire" is played, the dramatic-realistic description is presented using tragedy theatrical techniques, depicted by the lone blue piano, to introduce depressed, solitude, and violent characters. It takes place on the first floor of a two-bedroom apartment, and relates cycles of violence.
The blue piano appears in the introductory stage directions of the first scene, expressing a theme of desire and spirit lonelines of people in New Orleans.
