The Remarkable "Curvature Blindness" Illusion

A new optical illusion has been discovered, and it's really quite striking. The strange effect is called the 'curvature blindness' illusion, and it's described in a new paper from psychologist Kohske Takahashi of Chukyo University, Japan.
Here's an example of the illusion:A series of wavy horizontal lines are shown. All of the lines have exactly the same shape - a sine curve. However, half of the lines appear to have a much more triangular, "zig-zag" shape, when they are superimpose