Chalk drawing by David Zinn, Summer 2011.

I brought breakfast! card

Chalk drawing by David Zinn, Summer 2011.

Classic Optical Brain Trick with two cute foxes. Foxes are known to be smart, but they can't figure it out. There is difference in answers of the same persons when changing the view positing. From one angle it seems that there are 4 rods while seeing it from the other side it is 3. How is it possible?

Optical illusion Trick T-Shirt

Classic Optical Brain Trick with two cute foxes. Foxes are known to be smart, but they can't figure it out. There is difference in answers of the same persons when changing the view positing. From one angle it seems that there are 4 rods while seeing it from the other side it is 3. How is it possible?

Temporary street art by chalk artist David Zinn of Ann Arbor, Michigan. See other examples of his work at www.zinnart.com, sluggoonthestreet.tumblr.com or www.facebook.com/DavidZinnIllustration. image ©2012 David Zinn

Troll gifting sluggo poster

Temporary street art by chalk artist David Zinn of Ann Arbor, Michigan. See other examples of his work at www.zinnart.com, sluggoonthestreet.tumblr.com or www.facebook.com/DavidZinnIllustration. image ©2012 David Zinn

Optical Illusion - Impossible Cube

Optical Illusion - Impossible Cube T-Shirt

Optical Illusion - Impossible Cube

My Wife and My Mother-in-Law Optical Illusion Customizable Poster

My Wife and My Mother-in-Law Optical Illusion Poster

My Wife and My Mother-in-Law Optical Illusion Customizable Poster

An eye distorted by the aura of a migraine seems to be in endless pulsating motion in this op art design.

Migraine Aura Optical Illusion Postcard

An eye distorted by the aura of a migraine seems to be in endless pulsating motion in this op art design.

Classic Optical Brain Trick with two cute foxes. Foxes are known to be smart, but they can't figure it out. There is difference in answers of the same persons when changing the view positing. From one angle it seems that there are 4 rods while seeing it from the other side it is 3. How is it possible?

Classic Optical Brain Trick with two cute foxes. Foxes are known to be smart, but they can't figure it out. There is difference in answers of the same persons when changing the view positing. From one angle it seems that there are 4 rods while seeing it from the other side it is 3. How is it possible?

Vintage Victorian Kitsch Skull Optical Illusion, neat classic dual image optical illusion of a happy young partying couple or is it a illustration of a skull? It's a skull!

Vintage Victorian Kitsch Skull Optical Illusion Postcard

Vintage Victorian Kitsch Skull Optical Illusion, neat classic dual image optical illusion of a happy young partying couple or is it a illustration of a skull? It's a skull!

Card with an optical illusion "Old man or man on a horse leaving another man sleeping?"

Optical Illusions Postcard

Card with an optical illusion "Old man or man on a horse leaving another man sleeping?"

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