Cool Optical Illusion Collection #4

Hole in your hand
hole in your hand

Here's a great optical illusion you can do with an empty paper towel tube. Hold it next to your hand and then let your eyes relax, focus on the distance and it will appear that you are looking in a hole in your hand! This is one that kids will really like, so next time you are looking for a new way to entertain a child, try this technique!

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