Checkerboard

Slightly warped.

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With straight red lines overlaid on top of the image, it becomes more obvious that the bulge is an illusion. Still, the illusion is so powerful that even the red lines seem to want to warp a bit!
With straight red lines overlaid on top of the image, it becomes more obvious that the bulge is an illusion. Still, the illusion is so powerful that even the red lines seem to want to warp a bit!

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