I'm reminded of the Radio Shack infrared sensor card I have somewhere. It works like those glow-in-the-dark stickers that you charge up under a light, then tak

I'm reminded of the Radio Shack infrared sensor card I have somewhere. It works like those glow-in-the-dark stickers that you charge up under a light, then take into a dark room to glow. Except the IR card would not glow until hit by infrared, like from your TV remote. Then it would light up red as the "charged up" energy would kick infrared up into the visible spectrum. (or probably vice versa)