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Stand back from your computer monitor,
about 10 feet.
Watch the screen, and blow a raspberry
(and why do they call it a raspberry?).
Try varying
the pitch of your raspberry. Or try one sounding
this way.
What happens if you tilt your head horizontally?
Does this work with all monitors? What about photocopiers
and apples?
Why do you see the screen get distorted
and wavy?
The raspberry makes your eyes jiggle up
and down.
Every time your eyes move, they form an
image of the screen in a slightly different spot. So the raspberry
makes the screen seem to jump up and down.
But the monitor isn't like a regular picture.
It builds pictures gradually, just one horizontal line at a time
(wanna see a scan line?), starting
with the top line and quickly scanning to the bottom.
If your eye moves when the picture isn't
finished, it distorts the picture! |
