So, I've been experimenting, and have found that a phone screen, while the phone is powered off, makes for a great shiner to peek a selected card. Say you spread the cards towards the spectator, and they select one. A quick glance, and you know what their card is. As long as they're comfortable with the idea of your phone being in front of you, it works. Has there already been work done on this? And what do you think about it as a viable table magic method?