Delboeuf Illusion
Research has shown that presenting a food portion in a smaller bowl creates the illusion of a larger portion. Conversely, presenting the foot in a larger bowl creates the illusion of a smaller portion. The quantity of the food remains the same. This phenomenon is known as the Delboeuf illusion.
This illusion forces your mind make a judgement about the relative size of an object (i.e., the cereal presented above). A study from 2005 suggests that this illusion works in a fashion similar to the Ebbinghaus illusion.
The illusion gets its name from Joseph Remi Leopold Delboeuf who created it in 1865. Delboeuf was a Belgian philosopher, mathematician, hypnotist, psychologist, and psychophysicist. A busy man indeed!
Another example, in its most simplest form, is presented below:
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