In this work from Professor Akiyoshi Kitaoka, each of the four fields appears to expand and move toward you.  Like all of these motion illusions, the more you move your eyes around the image, the stronger the effect.  Try to hold your eyes still by looking at one location and the movement will cease.

Visit Kitaoka’s site to view more of his work in this field.

Other Optical Illusions You Might Enjoy

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