How cool is this…
http://www.i-am-bored.com/bored_link.cfm?link_id=30241
Wonder who or when they thought of trying this out…? Good though 
Thats amazing:cool:
no way…
I started to type an explanation of this earlier on . . . it’s very interesting and you can do something similar at home if you want to with a tin tray or sheet of flat plastic and an old speaker.
you need to get out more
lol
I know :crying:
seen that before, very good 
Yea, old, but cool.
Notice how as the the pitch rises, the (single) sound wave goes through more oscillations and they are reflected in vibrations on the board.
Yea. Cool.
BTW. “way!”
That was brilliant.
exactley what i thought :ermm:
Oh yes, oscillations… that’s just what I was thinking. And the reflections are interesting too. 
:D:D My cat didn’t like that one bit, she was going completely spastic :D:D