[sdiy] switching and sensing

[Rafael Cohen]

Hey all,
 I am interested in building something for an automatic-performance in an
art gallery (in the window of an art gallery to be specific) where the
audience on the outside will have some way to interact with the action on
the other side of the glass. I thought of two things I would like to pursue.
 1) Photocells
2) Touch point circuit completion a la Crackle-Box (I imagine that
conductive mylar could be good for this).
 I would love any information about how to build a circuit that could switch
things on and off with interaction in this way. I have some experience with
photocells, but not as switches. Some sort of comparator maybe? Relays? I
have no experience with relays.
 Any help greatly appreciated.
 Best,
Rafael
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