At 16:20 5/9/96 EDT, you wrote:
>We're trying to create a mechanical interactive for our exhibit about blood. We
>want visitors to see an oversized vial of separated blood. Then they shake it
>up, and then the vial appears to be filled with whole blood. Then it resets for
>the next visitor.
>
>Has anyone seen anything remotely similar to this? We've been imagining beads,
>glycerin, colored light, paint shakers, snow globes, etc. but we can't make it
>work. Any tips will be much appreciated.
>
>

Sharyn,

Have you tried plain old oil & vinegar, or oil & water?

Robyn