I would like to have a map, that with a press of a button, will show  a
lava flow, then an ice flow, and a flood area.  These three areas would be
show their flows over the same map.  I was thinking about fiber optics,
but there must be other ways to do this...  It would be nice if each of
the flows could be a solid color.  It seems to me that I have seem someone
do this with different layes of glass, and was able to light up each
one...    Anyone done this before?

David Lynx

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Our town motto:  Its not the end of the world, but you can see it from here.