Hall effect sensors

[Paddock, Toby]

Remember those pendulums with a magnet on the end that swings above a 
card with other magnets glued on?
Give it a swing and the magnets interact and it gives a wacky 
pattern.
Glue hall sensors (or reed switches) between the magnets and give it a 
swing and it gives wacky trigger patterns.
Or build a bigger pendulum, skip the lower magnets, put sensors in a 
pattern.  It would run longer and be more repetitive.
Not for use under water, but would be good for kids.  Hey, I think 
I'll try it with my kids.

Hoping this finds you,
Toby
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"Everything is going digital, even computers."
    -- overheard from a cellular phone salesman.