Part of the impromptu definition it says with little or no setup. This "little" could probably be said as impromptu.
Thanks for all the interest in Witness.
Yes, it uses a zip-lock bag.
Yes, this is something I've done at my lectures if you've seen me live.
Yes, it's been in a set of notes before under the name Deuce Bag.
Yes, it has no gimmicks.
This is the first time my piece has been shot on video. Every nuance and detail has been filmed by WH and DH to ensure you're going to learn it, and more importantly --- perform it.
While I won't reveal too much about the pre-release, I'll just say to keep you're eyes focused on theory11 for more juicy details.
Guaranteed you'll love to perform Witness!
Thanks for asking guys.