I came upon this image wandering the interwebs:
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It inspired an idea for using this in a haunt scene. It would require at least 4 people.
Obviously, it would require the actress out front.
Behind the wall there is one person to play the left hand and one to play the right. They are both standing on a platform. The platform is part of the wall and protrudes onto the side the actress is standing on.
In the act, the actress walks freely, but is grabbed by the hands. She screams and tries to free herself.
At this point, the third person, assisted by pulleys and a counterweight, lifts the platform into the air. The wall, which is really just a cloth backdrop with no pattern, rises too, but to the audience, it looks like the woman is lifted bodily into the air by the hands.