The Shrunken Finger Illusion

– Vebjørn Ekroll, Bilge Sayim, Ruth Van der Hallen and Johan Wagemans:  “The Shrunken Finger Illusion”. University of Leuven, Belgium

In the video about the “shrunken finger illusion”, we show you how you can make your own finger feel shorter by putting it into a halved ping-pong ball. To experience the illusion, look at your finger directly from above, with your finger extended upwards towards your eyes. Then, put the halved ping-pong ball on top of it, such that your finger is inside the ball. Now, when you look at the halved ping-pong ball, it will look like a complete ball. But what about your finger? It feels shorter, as if to make space for the illusory ball!

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