Everything about The Ponzo Illusion totally explained
The
Ponzo illusion is an
optical illusion that was first demonstrated by the
Italian psychologist
Mario Ponzo (1882-1960) in
1913. He suggested that the
human mind judges an object's size based on its background. He showed this by drawing two identical lines across a pair of converging lines, similar to
railway tracks. The upper line looks longer because we interpret the converging sides according to
linear perspective as parallel lines receding into the distance.
In this context, we interpret the upper line as though it were farther away, so we see it as longer – a farther object would have to be longer than a nearer one for both to produce retinal images of the same size.
Some researchers believe that the
Moon illusion is an example of the Ponzo illusion
(External Link
), with trees and houses playing the role of Ponzo's converging lines. Foreground objects trick our brain into thinking the moon is bigger than it really is.
One of the explanations for Ponzo illusion is the 'Perspective hypothesis', which states that the perspective feature in the figure is obviously produced by the converging lines ordinarily associated with distance, that is, the two oblique lines appear to converge toward the horizon or a vanishing point. Another is the 'Framing effects hypothesis', which says that the difference in the separation or gap of the horizontal lines from the framing converging lines may determine, or at least contribute to the magnitude of the distortion.
This typical visual illusion also occurs in touch and with an audition-to-vision
sensory substitution device. However, prior visual experience seems mandatory to perceive it as demonstrated by the fact that congenitally blind subjects are not sensitive to it.
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