Author Topic: illusion_ponzo effect 2  (Read 5883 times)

Fu-Kwun Hwang

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illusion_ponzo effect 2
« on: December 17, 2010, 05:50:12 pm »
Are those two yellow bars the same width?

You can drag more from the top one (Up to 10 bars).

Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
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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.

lookang

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Re: illusion_ponzo effect 2
« Reply #1 on: December 23, 2015, 09:32:47 am »
appears to have a problem with the ejs download while the source is correct.

i managed to recompile and attached to share for the benefit of others