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The thing that is so surprising is the AMOUNT of bending that this illusion creates:
So how does this illusion work? It is a variation on the “Hering illusion”, which you can see demonstrated on this page:
The standard Hering illusion (1861)
If you look at this page you can see one aspect of the illusion. The diagonal lines create a vanishing point. Our brains expect certain things to happen around vanishing points. So when it applies those assumptions to the straight red lines, the red lines bend.
Look at the tiny squares on the checkerboard. They are creating diagonal lines just like the Hering illusion. These diagonal lines create the same bending seen in the Hering illusion.
More cool optical illusions:
- Amazing Animated Optical Illusions – Plus, how to make your own
- Three great optical illusions on video
- A great optical illusion – the diamonds that change colors
- Today’s optical illusion is brought to you by the color Yellow
- Two optical illusions for your viewing pleasure
- A most impressive optical illusion
- Seven great optical illusions
- the perception of images
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