My impromptu(ish) version of Penn and Teller's Shadow Rose

Hey guys, I have been working on this for a while, but I have finally come up with a nearly impromptu version of Penn and Teller's shadow rose effect.

It's not totally impromptu, because of course you need a vase of flowers and a strong light to project the shadow. But this can be done with nearly any type of flower (Anything that has smallish petals, this will not work for the likes of tulips). The flowers require hardly any setup, so you should be able to preform it using someone else's vase. Obviously this will only be suitable for dinner parties and the like. I commonly preform it by putting the vase on a table near the wall and tilting a lamp towards it.

One of the major restrictions with my version is it will not work if the lamp uses those new energy saving bulbs (The ones where the glass is kinda coiled) you need to use one of the older ones (Which most people have anyway)

I don't think I will be able to sell this effect as it is a Penn and Teller item obviously, but I am more than willing to share the method with any forum members of good standing (IE anyone that strikes me as having a serious interest in magic)

If you have not seen the effect, Penn and Tellers version is HERE : http://www.youtube.com/watch?v=un1pNtmYguA

My version is here : <clipped> (As you can see there are one or two kinks that need to be ironed out, but I have a couple of ideas)