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The fact that the inner corner of a room looks farther away than the outer corner of a building provides one explanation of the :

  • A.Ponzo illusion
  • B.Ames room illusion
  • C.Poggendorf illusion
  • D.Müller-Lyer illusion

Answer: D

This explains the Müller-Lyer illusion.

Richard Gregory's misapplied size-constancy explanation notes that the arrow-fins of the Muller-Lyer figure resemble corners: outward fins look like the inside corner of a room (which looks farther away), and inward fins like the outside corner of a building (which looks nearer). The brain enlarges the line that seems farther, so the line with outward fins looks longer.

The Ponzo illusion uses converging lines like railway tracks, the Ames room uses a distorted room seen from one viewpoint, and the Poggendorff illusion involves a diagonal line interrupted by a rectangle; none rests on the corner explanation.

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