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