Max has given us another great effect here with detailed explanation that shows us exactly why it
works. Basically, if you can write 8 letters on a piece of paper (and you can even do that ahead of
time if you are afraid of messing up during performance), and if you can explain how to cut the
edges off the paper (basically, "cut the edges off the folded paper"), you can do this self-working
mentalism effect.
The only possible way I could see this not working would be if your
spectator either did not follow your instructions (again, not difficult) or if they might not have
the best vocabulary to draw from. Otherwise, any teenager or older should be able to do this with
you.
Can you repeat it? Well, that depends. If you want to do it for two spectators like
Max does in the video, then no. However, if you decide to do this for the same spectator at
different times, you could do this twice and they wouldn't notice the discrepancy between the two
performances.
I love material that allows you to concentrate on performance rather then
worry about method through the whole thing. Kirigami fits that perfectly. There are so many ways you
can play this, it's really limited only by your performance style. It's powerful and easy to do, and
taught by a master of the craft.