A silk visually penetrates through a borrowed phone
Super visual, strong impact, and practical!
The magician borrows a smart phone from a spectator. He then rubs the silk on the center of the screen and suddenly the silk starts penetrating through the smart phone.
Eventually the silk penetrates all the way through the smart phone
The smart phone is immediately returned to the spectator for examination, however, (of course) there is no slit or secret hole at all!
Super visual yet easy to do. Plus, this miracle can even happen with a borrowed smart phone
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