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This Week's Experiment - #323 A Hole in Your Hand
This week's experiment is an old one and an easy one. It is a simple
illusion that makes it seem that you have a hole through your hand. You
will need:
a sheet of paper
Roll the paper into a tube. It should be at least large enough to stick 2
fingers into. Hold the tube up to your right eye, so that you are looking
through it. Hold your left hand about 6 inches in front of your face, with
your hand open, the palm facing towards you, and the base of your little
finger against the side of the paper tube. With both eyes open, you should
see a strange sight. You will see your hand in front of your face, with a
hole through it. If you don't, try moving your hand a little farther away
until it comes into focus.
What is happening? Normally, both of your eyes see the same thing, just
from slightly different angles. Your brain combines these two slightly
different views to let you see in three dimensions and judge distances. We
have changed that. We are giving your brain two different images. One eye
is seeing the palm of your left hand. The other eye is seeing the other
side of the room, viewed through the tube. In combining the two images,
your brain has to decide what is more important to see. Most of the view
from your right eye is blocked by the dark sides of the tube, so you mostly
see the view from your left eye. The one exception is the bright circle of
image that your right eye sees through the tube. Since this is the one
bright spot from your right eye, your brain pays extra attention to it. As
your brain combines the two images, you wind up seeing your hand with a hole
through it. If you want to play games with your brain, try watching
television this way. Even better, have someone stick their finger into the
end of the tube. That is a strange site, indeed.
Have a wonderful week.
These experiments are from Robert Krampf - The Happy Scientist
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