If you want to experiment with the technique, you can make inexpensive prototypes using the silvery film used to coat house windows to reflect sunlight. Most large home improvement stores stock it, and it's much more forgiving and less expensive than half-silvered glass. You can either mount it in a thin wood frame or apply it to a sheet of Plexiglas or storm door glazing. It's even available in different degrees of opacity, allowing you to experiment with different combinations of lighting and reflectivity.
Good luck!

Chuck Stout
Interactive Developer
Exhibits Design and Development
Denver Museum of Natural History
2001 Colorado Boulevard
Denver, Colorado 80205
303-370-8364
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