I asked a friend to serve as an altar for a ritual. She asked if the "spell" was to be cast on her. That got me thinking. Could it be done, has it been done?
If she isn't the subject of your conjuration (e.g., you're throwing a hex but she's not the person you're trying to curse), and she doesn't harbot any guilt by being there, then no, she doesn't "catch" anything. She's essentially there as a participant, just like anybody else participating in the ceremony. It's just that her role in the ceremony happens to be physically passive (essentially she just lies there), rather than active (ringing the gong, etc.).
I'm assuming that's what you meant. If you DO want to make her the TARGET of your conjuration too, this could get a little strange. Come to think of it, the only one of the three conjurations that would apply here is the Conjuration of Compassion. (You wouldn't be throwing a hex or a love spell on somebody right in front of you! Or at least not within this context of a formalized ritual.) But again this would be strange, because that kind of self-consciousness shouldn't be a part of ritual, and it's hard to keep that in mind when your subject is right there. But I suppose the psychodrama could be effective under the right conditions.
On another note I was surprised finding an altar was that easy.
Come to think of it, I've found that to be true in my experience too. Some women just feel devious and want to participate in the forbidden thrill of a "Satanic Ritual". I knew one female Satanist who said she most preferred serving as altar "because it's the easiest", as there are no special movements or things to recite.
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