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Go into a very dark room on a bright day.
Make a small hole in a window cover and look at the opposite wall.
What do you see? Magic! There in full color and movement will be
the world outside the window - upside down!
This magic is explained by a simple law of the physical
world. Light travels in a straight line and when some of
the rays reflected from a bright subject pass through
a small hole in thin material they do not scatter
but cross and re-form as an upside down and backwards
image on a flat surface held parallel to the hole. more
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