>> This uses a PIC to strobe lights that make drops of water go slow,
>> stop, or even backwards.  There is a short video that was pretty
>> impressive.
>>
>> http://cre.ations.net/creation/the-time-fountain
>
>Cool.

It is rather. Sort of thing that it wouldn't be too hard to build. had a 
look at eBay.uk and this guy has a selection of dyes ... 
http://stores.ebay.co.uk/Scuddlebutt3

>I'm in the market for pond ideas.

Oh dear, Jinx is becoming Pond Life ... Is this reverse evolution ... ???

>Will have a think about how I could use that. Working on this
>
> http://home.clear.net.nz/pages/joecolquitt/full.jpg
>
>Any ideas you've got, no matter how nutty (short of using it as
>a nut bowl) appreciated. And the more PICs the merrier. Have
>thought of the obvious - lights, selectable water jets, waterfall,
>fountain, fogger etc. Maybe small RC submarine or other thing
>to keep fish entertained/on their toes (fish fingers ?), mirrors etc
>
>Pond is 1.8m square, 70cm deep, water supply has a 1.6m head
>at about 1500l/hr. Possibilities for waterwheels (hydropower for
>battery or other low-power devices ?) and other mechanicals

I would be tempted to try and arrange one of those jets that produces a 
"rod" of water going across the pond. have several, each with a different 
coloured dye (see eBay link above for "starter" dye sets) and some UV Leds, 
and pulse the water for short enough periods you could seem to have 
different coloured rods of water stationary above the pond at different 
angles. Trouble would be you couldn't move the water fast enough to keep it 
stationary, and the strobing would be obvious. Still make a talking point 
for guests at the barbie ... 

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