[Harp-L] weird harp effect

[Garry Hodgson <garry@xxxxxxxxxxxx>]

so i'm sitting at the computer yesterday, waiting for somethng to finish.
there was a D harp on the desk, so i picked it up and starting futzing around.
and at some point i see, just for a moment, these wavy horizontal lines on
the screen.  not sharp, distinct lines, but a series of evenly spaced (1/2" or
so apart) horizontal bands of fuzziness.  hard to describe.

after a little experimenting, i find i can reliably repeat it.  it happens every 
time i play the 3 draw bend (i forget which one), and lasts for exactly the
duration of the note.  i didn't try it with the same hole/bend on another harp,
or playing the same note on a different harp.  nor did i try a different monitor.

but i'm curious whether this is a physical or perceptual event.  that is, are the
sound waves at some particular frequency interacting with the electromagnetic
fields near the screen?  or is that note making my skull/eyeballs vibrate in such
a way that i see an odd visual effect?  or am i just nuts?  not that this option 
would necessarily rule out the other two...

insight, anyone?


----
Garry Hodgson, Senior Software Geek, AT&T CSO

do for others with no desire of return.
we should all plant some trees
we will never sit under.