I recently came across an interesting coffee mug that is available for sale on Zazzle.  As a fan of optical illusions, I thought it was a very clever design for an otherwise ordinary drinking vessel.  The spatial geometric design gives the illusion that the mug is concave rather than having a truly cylindrical design.

If you’d like to order your very own optical illusion coffee mug, you can find it here.

Other Optical Illusions You Might Enjoy

Peace 3D Stereogram Optical Illusion Video

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Moving Snakes Motion Illusion

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Delboeuf Illusion

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Dual Axis Illusion

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Charlie Chaplin Optical Illusion

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The Art of Optical Illusions Book

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