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Jane, depending on what you are trying to show, the rheoscopic fluid  
made by Kalliroscope might work.  This is the stuff you see in exhibits  
like Ned Kahn's fluvial orb.  When moving, it reveals turbulence  
patterns, eddies, and other flow patterns in great detail, and can be  
sealed between two sheets of glass (in fact, is almost always used that  
way.)  Chuck

On May 2, 2006, at 12:42 PM, Jane Bard wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology  
> Centers
> Incorporated, a worldwide network of science museums and related  
> institutions.
> *********************************************************************** 
> ******
>
> Our museum is developing an exhibit related to our neighboring river  
> and we
> are looking for ways to represent the river in a hands-on way without  
> using
> water.  Has anyone ever seen an exhibit that uses another material to
> effectively take the place of water in showing a flow pattern?
> Thanks!
> Jane
> ________________________________________
> Jane Bard
> Director of Education
> The Children's Museum of Portsmouth
> 280 Marcy Street
> Portsmouth, NH  03801
> 603-436-3853
> 603-436-7706 fax
>
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