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;-) it's a game I play with my children to show them how easily our eyes are tricked and how important it is to train the brain to be as open as possibel for any surprise the eyes can see :-) On the picture you see our (worn) kitchen table viewed through the paper roll (you mentioned in your other comment). I tipped the roll for a millimeter so the flash of the camera creates the light you see... you can even move the paperroll over a survace and trick your eyes - try it out!

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