This is a well known trick and one which I have used many times. I knew the original and could see
enough from the trailer to see how the "rainbow" part had been added - and how it would enhance
actual presentation. I knew another method to create different target numbers so the one presented
here is a bonus and would expand the range of this trick to include on the fly presentations. The
card trick variation at the end is something I would never have thought of / noticed and which
really adds to the options. So, this download really adds to the well known presentation.
Even if, like me, you know about this trick / procedure I think the download is worth it as it
does add to it and provide some other options.