iPhone & iPad magic tricks.
Turn your iPhone into an X-Ray machine and use it to watch a punched hole travel the length of a chosen card.
The spectator selects a card from a regular deck.
Using a permanent marker you draw a small cross at one end of the chosen card.
At the opposite end, you punch a hole - the card can be shown freely.
You now introduce your iPhone running an X-Ray app. Placing the card under your iPhone, you turn the X-Ray to full power.
The chosen card, with the hole and cross at opposite ends, is clearly visible.
Now the impossible happens - with a gentle shake, the hole starts to move. It keeps moving until it reaches the cross.
The card, now with a relocated hole, can be fully examined.