I am thinking of adding Andrew Mayne's Passage to my show. I really like the idea of NOT using a large prop but a spectator instead. I am very concerned that the audience member helping will be able to tell exactly what is going on.

Does anybody actually do this effect in their show? What are the reactions? Does the "assistant" feel you make the move? (I have a H***Z *P)

What about Bisection?

Thank you!

I know exactly what you are thinking. There are a couple of way to reduce making it known to the audience member. Practice practice, practice. You must be as silent as possible. Having music played while you do it will help too. Have them stand on a chair so that their auditory senses are fooled more. All the sound will be down below. Lay a carpet down if needed to dampen sound of shoes.
And practice, practice, practice.

Bisection is a quick trick and should be used in with conjuction with another effect. Done right (again practice, practice, practice), you'll get gasps from the audience. But don't linger too long. It is a quick shock effect.

I should add, that these are not the strongest effects. They are very angle sensitive. But Passage and all the other variants can be very entertaining. I do a comedy routine with Passage and it works very well in that format. I have not done it as a serious piece.