Ed. note: this post appeared previously at Sleights of Mind.
Think that your eyes are bigger than your stomach? Well, actually, yes… they are.
The Portion Size Illusion is a new variant of an old classic illusion called the Ebbinghaus illusion, in which a circle surrounded by smaller circles looks bigger than the same circle surrounded by bigger circles. It shows that, to your visual system, everything is relative.
– Stephen Macknik
Secrets of the Universe: Past, Present, FutureX