What to do?
Take the pencil in one of your hands and hold it tightly between your thumb and forefinger, in front of your monitor. Hold the pencil so it is vertical, very close to the monitor.
Now wave the the pencil back and forth in front of the monitor. Does it stay straight? Does it curve? Does speed of movement change the pencils behavior?
Now hold the pencil horizontally and repeat the above step. Does anything happen?
What is happening
The monitor redraws the screen from top to bottom at a rate near 60 Hz. This means that it will act like a strobe light, and allow you to "stop" fast motion. But since it is drawn from top to bottom, it will stop the motion at different points! So it will look like the pencil has curved: the top will be stopped at one time, and the bottom at another time!
When you hold the pencil horizontally, this does not happen. Why not?
(Note: we have been doing this with Mac monitors, where it works really well. We are not sure it works with PCs too, but we guess that it does. If you find any cool or unusual effects, let us know! You can write to us using the form here.)
SO COOL, I REMEMBER MY FATHER DOING THIS "TRICK" FOR US, EITHER WAY, VERTICAL OR HORIZONTAL, WHEN YOU MOVING WITH CERTAIN ABILITY , THE PENCIL CURVES A LOT! EVEN GET SMALLER, WAS FUN TO DO THIS AGAIN AND REMEMBERING MY POPS!!!
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