audience participation II

[Dave Halliday]

>     You could try placing some LDRs or phototransistors low down at
>     the edge of the dance area. Their output would change with the
>     lights and as people moved between them and the lights.


Just an idea - you could get some cheap laser diodes ( I have seen 
laser pointers for sale at discount office stores for about $20 these 
days - excellent cat toy as well! )

Have them set up near one end of the stage and set to point at
photocells at the other end of the stage - use a little bit of smoke 
to make the beams visible and let people block the beams with their 
hands...

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