Visual Illusions

• What does the brain sometimes perceive when there is no actual distance?

  Illusions
• Which illusion uses converging lines to create the illusion of distance?

  Ponzo illusion
• In the Ponzo illusion, how does the brain adjust the perceived size of the lines?

  Scales the distant line up
• Which illusion uses inward and outgoing fins on lines?

  Müller-Lyer illusion
• In the Müller-Lyer illusion, what do outgoing fins resemble?

  Inside corner of a room
• In the Müller-Lyer illusion, which line does the brain mentally scale up?

  The line with outgoing fins
• What type of visual illusion has two possible interpretations?

  Ambiguous figures
• What is the name of the ambiguous cube illusion?

  Necker cube
• How can the Necker cube be perceived?

  Upwards right or downwards left
• What type of visual illusion causes the brain to perceive something that isn't there?

  Fiction
• What is the name of the illusion with illusory contours and overlapping triangles?

  Kanizsa triangle
• In the Ponzo illusion, what does the brain do with the perceived size of the closer line?

  Scales the closer line down
• In the Müller–Lyer illusion, what do ingoing fins resemble?

  Outside of a building
• In the Müller–Lyer illusion, what do outgoing fins resemble?

  Inside corner of a room