I never purchased the Shrinking and Growing Head Illusion until I saw it performed at an Abbott Get Together a little while back. When seeing it performed it looked awesome, during the performance, Bruce Kalver put on a Halloween mask (a gorilla mask) and did the effect and it really looked creepy. This was not done in a small group but on a large stage in front of a thousand people or so. It seemed like everyone in the audience was captivated by the effect.
Not a whole lot of negatives on this one, the effect is reasonably priced, you will need to use a cordless screw driver at a low speed to get the best effect. The effect comes with the necessary hardware to attach it so you really should not have an issue. It is repeatable, Bruce repeated it when I saw it and it was just as entertaining as the first. If you do this right, they will almost demand it be repeated. The effect cannot be performed surrounded because people in the back would not see the spinning disk.
You can control whether or not the head shrinks or grows by the direction the disk spins (clockwise or counterclockwise).
A word of caution, the effect seems to work better the further away an audience is, so this is really best suited for a stage. I tried it at a couple gatherings where people were close and did not get the same response as I did with a larger group and people further away.
Without doing a thing, you perform the most talked about illusion in your act!
DO NOT CONFUSE THIS WITH ANY OTHER SPIRAL ILLUSION. YOUR HEAD ACTUALLY LOOKS LIKE IT IS INFLATING LIKE A BALLOON!
The magician displays a 15-inch, specially made spiral disk; imagine the kind a hypnotist might use. The spiral is spun and you instruct the audience to stare at the spiral and not look away. You start to count backwards from 10 to 1, and when you reach one, you tell the audience to look at your nose. TO THEIR AMAZEMENT, YOUR HEAD BEGINS TO GROW LIKE A BALLOON BEING INFLATED!
Every audience will want you to do it again so this time you have the audience select a partner. Spin the disk the other way, and when they look at their partner THEIR PARTNER'S HEAD BEGINS TO SHRINK!
The spiral can be seen in large auditoriums. It is perfect for birthday parties. People are amazed and always yell "do it again!" The hardest part of this illusion is trying to keep a straight face as your entire audience stares at you in disbelief with their mouths wide open. You are going to love this!