Optical illusion In the image above, all the lines are exactly the same despite how they appear.
Optical illusion In the image above, all the lines are exactly the same despite how they appear.

Do you see a wavy line or a zigzag?

A VERY trippy optical illusion dubbed "Curvature Blindness" is being widely shared online and promises to be the latest internet meme to blow your mind.

And according to the people who found it, the phenomenon has never been previously reported.

Japanese cognition and illusion researcher Kohske Takahashi provided an extensive scientific breakdown and analysis of the optical illusion in a recent edition of the journal i-Perception.

In the image below, which displays the illusion, all the lines are exactly the same despite how they appear.

“To the best of our knowledge, no one has reported about this phenomenon,” researchers said.
“To the best of our knowledge, no one has reported about this phenomenon,” researchers said.

"Here, we report a novel illusion -- Curvature Blindness Illusion -- that will provide novel implications for contour perception, in particular, for the underlying mechanisms of curve and corner perception," Mr Takahashi wrote.

Put more simply, our eyes can be tricked into seeing a wavy line as a zigzag line depending on the colour scheme of the line and the background. In the above image, the lines observed on the grey background appear to be in a zigzag pattern, as our brains are tricked into imagining a corner.

"Physically, however, all lines are wavy lines with an identical shape; there is no triangular wave and hence there is no corner," Mr Takahashi said.

"Despite the simplicity and effect magnitudes, to the best of our knowledge, no one has reported about this phenomenon."

It's unclear exactly why our brains perceive the zigzag contour, but Mr Takahashi proposes that our brains default to seeing corners rather than curves when they get confused.


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