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hey martin  check with science place in dallas (paul vinson - you can get
his email off their web site scienceplace.org)

they had one a couple of years ago and i think they used a mirror...

i've always loved this particular exhibit - as much for the aesthetic as
anything else.  seen at other centers and confess not sure how many people,
particularly kids 'get it' (whatever that means.....) in other words, never
seen it be what i might call a real engaging exhibit/experience.  my 2cnts
:)

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