In article <[log in to unmask]>, Arie Avidor <[log in to unmask]> writes >Does anyone have any ideas on activities connected with exhibition dealing >with Diamonds? >Arie Avidor You might like to illustrate the hardness of diamonds. There are any number of ways of doing this but you could, for example have a series of styli, (assumed plural of stylus!), with points of materials of different hardnesses. These could be uses to attempt to inscribe plates of other materials. I seem to recall a hardness scale based upon this method. Also of interest in this contex is the hardness and other properties of graphite in comparison to diamond, both being carbon. This could lead into visitors creating crystal structures, testing for their strength, rigidity etc. The refractive index of diamonds, coupled with the ways in which they are cut give them their brilliance. There are many interactives based upon this property which could be modified to relate to diamonds. Good luck with the exhibition. Julian Ravest Museum Consultant Everyone's actions are rational within the world as they see it