Americas got Talent illusion

[xanderma]

OK, I might be a bit naive, but I can't for the life of me see how this is done. Anyone put me out of my misery?!

https://www.youtube.com/watch?v=Mzksv2ipaTA

TIA

P.S. Posted on How it Works as well, not sure where I might stand best chance of getting an answer

[Hellyon]

Xanderma - It's MAGIC!!!

Don't try and work it out - leave a bit of magic and mystery in your life.

[xanderma]

Lol!! But I have to know....;-)

[Postdog]

ooh that is brilliant!