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Here's how to trick your brain into thinking that there is a hole in your hand.
Wow....there's a hole in your hand!
Your right eye will see the tube and your left eye will see your hand. When the two images are combined, your brain is tricked into believing there is a hole in your hand.

Don't read the words in this list - just say the colours they're printed in.
Try to do this as fast as you can.
It's not easy!
Lay a pencil over the edge between any two stripes and the adjoining stripes will look the same. It's amazing!
