Delboeuf illusion


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Delboeuf's illusion

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A few words

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Copyright © 1996-2017 Alexander Bogomolny

Delboeuf illusion


This applet requires Sun's Java VM 2 which your browser may perceive as a popup. Which it is not. If you want to see the applet work, visit Sun's website at https://www.java.com/en/download/index.jsp, download and install Java VM and enjoy the applet.


What if applet does not run?

This kind of assimilation illusion is associated with the name of Franz Joseph Delboeuf, a Belgian philosopher. The copies of the same shape - circles and rings in our case - appear to inherit properties of their environment. Two equal circles - one inside a bigger circle, the other containing a smaller circle - seem to have different sizes.

References

  1. The Mind's Eye, Readings from SCIENTIFIC AMERICAN, W. H. Freeman and Company, 1986

|Contact| |Front page| |Contents| |Geometry|

Copyright © 1996-2017 Alexander Bogomolny

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